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Ha Noi
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Ha Noi
92
5
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Ha Noi
92
6
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Ha Noi
85
7
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Ha Noi
82
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Ha Noi
81
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Ha Noi
81
10
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Ha Noi
76
11
nguyenlyhtf
Region
75
12
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Ha Noi
74
13
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Ho Chi Minh
68
14
Super Nicholas The MLG BACON HAIR
Ho Chi Minh
67
15
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Ho Chi Minh
65
16
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Ho Chi Minh
64
17
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Ha Noi
64
18
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Ha Noi
60
19
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Ha Noi
58
20
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Ho Chi Minh
57
21
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Ha Noi
55
22
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Ho Chi Minh
51
23
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Lai Châu
51
24
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Tiền Giang
51
25
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Ho Chi Minh
50
26
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Ha Noi
50
27
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Ho Chi Minh
46
28
Le Tien
Ho Chi Minh
46
29
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Ho Chi Minh
45
30
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Ha Noi
44
31
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Ho Chi Minh
44
32
Luatuadua
Ha Noi
40
33
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Ho Chi Minh
40
34
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Ha Noi
38
35
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Ho Chi Minh
38
36
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Ho Chi Minh
38
37
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Ho Chi Minh
37
38
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37
39
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Ho Chi Minh
36
40
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Sóc Trăng
36
41
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Ho Chi Minh
35
42
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Ho Chi Minh
35
43
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Nghệ An
34
44
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Ho Chi Minh
34
45
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Ho Chi Minh
33
46
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Ho Chi Minh
32
47
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Ho Chi Minh
32
48
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Can Tho
32
49
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Thanh Hóa
32
50
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Ho Chi Minh
31
51
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Ho Chi Minh
31
52
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Ho Chi Minh
30
53
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Ho Chi Minh
30
54
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Ho Chi Minh
30
55
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Ho Chi Minh
29
57
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Ha Noi
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58
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Ha Noi
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59
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60
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Ho Chi Minh
28
61
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Ha Noi
27
62
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Ho Chi Minh
27
63
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Ho Chi Minh
27
64
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Ha Noi
27
65
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Ha Noi
27
66
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Ho Chi Minh
26
67
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Tây Ninh
26
68
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Ho Chi Minh
25
69
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Ha Noi
25
70
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25
71
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25
72
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Ho Chi Minh
24
73
Hax.exe
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74
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Ðồng Nai
24
75
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Ho Chi Minh
24
76
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Ho Chi Minh
24
77
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Ho Chi Minh
24
78
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Ho Chi Minh
24
79
dz
Ha Noi
23
80
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Ha Noi
23
81
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Ho Chi Minh
22
82
Anonymous
Ho Chi Minh
22
83
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Hưng Yên
22
84
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22
85
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Ho Chi Minh
22
86
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Ho Chi Minh
22
87
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Ho Chi Minh
21
88
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Ho Chi Minh
21
89
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21
90
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21
91
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Ho Chi Minh
21
92
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Ho Chi Minh
20
93
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20
94
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Ho Chi Minh
20
95
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Ho Chi Minh
19
96
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Ha Noi
19
97
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Ho Chi Minh
18
98
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Ho Chi Minh
18
99
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Ho Chi Minh
17
100
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Ho Chi Minh
17
101
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17
102
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Ha Noi
17
103
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Ho Chi Minh
17
104
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Ha Noi
17
105
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Ho Chi Minh
17
106
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Ho Chi Minh
16
107
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Ha Noi
16
108
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109
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Ha Noi
14
110
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Ha Noi
14
111
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Da Nang
14
112
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Ho Chi Minh
13
113
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Ho Chi Minh
13
114
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Ha Noi
13
115
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Ho Chi Minh
13
116
Luận Hà
Ha Noi
13
117
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Ho Chi Minh
13
118
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Ha Noi
12
119
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Ha Noi
12
120
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Bình Dương
12
121
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Ha Noi
11
122
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Quảng Nam
11
123
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Ho Chi Minh
11
124
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Ho Chi Minh
10
125
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Ho Chi Minh
10
126
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Ho Chi Minh
10
127
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10
128
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Ho Chi Minh
10
129
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Ho Chi Minh
10
130
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Ho Chi Minh
9
132
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Ho Chi Minh
9
133
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Ho Chi Minh
9
134
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Ho Chi Minh
9
135
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9
136
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Ha Noi
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137
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138
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8
139
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8
141
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Nam Ðịnh
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142
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8
143
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Ho Chi Minh
8
144
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Ho Chi Minh
7
145
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7
146
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Kiến Giang
7
147
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Ho Chi Minh
7
148
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Ho Chi Minh
7
149
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Ho Chi Minh
7
150
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Ha Noi
7
151
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Ha Noi
7
152
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Ho Chi Minh
6
153
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Da Nang
6
154
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Ha Noi
6
155
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Ho Chi Minh
6
157
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Ho Chi Minh
6
158
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Ho Chi Minh
6
159
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Ho Chi Minh
5
161
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Ho Chi Minh
5
162
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Ho Chi Minh
5
164
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Ha Noi
5
165
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Ha Noi
5
167
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Ha Noi
5
168
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Ha Noi
5
169
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Ho Chi Minh
4
170
minh quang phạm
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4
171
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Ho Chi Minh
4
172
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Ho Chi Minh
4
173
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Ho Chi Minh
4
174
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Lào Cai
4
175
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4
176
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Ho Chi Minh
4
177
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Ho Chi Minh
4
178
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Ho Chi Minh
4
179
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Ha Noi
4
180
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Ho Chi Minh
4
181
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Khánh Hòa
3
182
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Ha Noi
3
183
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Da Nang
3
184
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3
185
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Ha Noi
3
186
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Ho Chi Minh
3
187
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Ho Chi Minh
3
188
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Ho Chi Minh
3
189
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Ha Noi
3
190
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Hai Phong
2
191
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Ho Chi Minh
2
192
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Ha Noi
2
193
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Ho Chi Minh
2
194
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Ho Chi Minh
2
195
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Ho Chi Minh
2
196
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Da Nang
2
197
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Ha Noi
2
198
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Ha Noi
2
199
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Ho Chi Minh
2
200
User
Ho Chi Minh
2
201
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Ho Chi Minh
2
202
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Ho Chi Minh
2
203
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Ha Noi
2
204
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Ha Noi
2
205
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Ho Chi Minh
2
206
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Vĩnh Long
2
207
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Hà Tĩnh
1
209
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Ho Chi Minh
1
210
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Ho Chi Minh
1
211
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Ho Chi Minh
1
212
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Khánh Hòa
1
213
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Ho Chi Minh
1
214
okwhatever
Ha Noi
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A Web App for Mathematics Training

Do you want to be fast at mental math? Many people do, but the options for doing the necessary exercises are simply too cumbersome for all but the most dedicated of trainees. In physical fitness, many people are interested in training their bodies but allocating the time, energy, and money for it is a significant obstacle. Likewise, lugging around books and whatnot for math practice is a threshold that just doesn't meet the standards of modern life.

Training yourself to be skilled at mental math needs to be quick and convenient. mathtrainer.org is a web app that works in your browser rather than a program you have to download and install on your computer or phone. This allows users to try and use the app without having to install new software. As a web app, updates are also much simpler. There is no need to download endless updates—the website will always be the most current version.

You can access a web app from any device connected to the internet and equipped with a web browser, including smartphones, tablets, and desktop computers. Moreover, you are free to use whichever browser you prefer, including Google Chrome, Safari, Firefox, and others. Google Chrome is the recommended browser for the best maths training since it tends to lead the pack in supporting the latest web technologies.

Math Trainer is designed to offer a similar experience regardless of what you’re using to access it, whether it be Android, iOS, Windows, or another operating system. Though an on-screen touch keyboard will appear on mobile devices, you may prefer to use the app on a desktop with a keyboard. Hopefully the advantages of a web app for convenient mathematics training are apparent.

Another part of making the app easy to use is eliminating the need for signing up and logging in. Users can get started with their math training as soon as they click the start button on this page. After progressing to higher levels in the app, your progress is automatically saved so long as your return to the site through the same browser.


What's a Mental Math Tip?

A mental math tip is a sequence of steps that can be taken to solve a math problem in your head. Click the arrow below to see an example for the following problem:

÷
984
3
328

A tip like this one is available for every problem in Math Trainer, so there's always help if you get stuck. With enough practice, you'll be able to predict what the tips will say—you'll have learned mental math!


Get Better at Mental Math

The ability to quickly perform mental calculations offers advantages in certain circumstances. But even without applications, getting better at mental math is a great way to stimulate one’s mind. It develops better number sense and intuition for quantifying the world around us. Practicing mental calculation will strengthen your foundation for learning more advanced maths topics.

Nonetheless, the tangible benefits of improving at mental math are many. It is certainly expected that educated people are able to do simple arithmetic without having to pull out a calculator. An inability to do so may reflect poorly on you, while being well-practiced in mental calculation will leave your contemporaries impressed. In many scientific and technical circles, mental math ability is even more highly regarded.

For students, mental calculation speed will often have a direct impact on math and science test scores. At all grade levels, it is not sufficient to know how to solve math problems when tests have a time limit on them. The highest-scoring test takers are able to answer questions both correctly and efficiently. Improving mental math skills will only benefit a student’s academic career.

Calculating the solution to an arithmetic problem in your head is often faster than pulling out a device to tell you the answer. For example, figuring out how much to tip a server at a restaurant is a straightforward arithmetic problem that many people are unable to perform without a calculator. By training your brain to solve basic math problems, you can save time in situations like these.

Mental math can also be relied upon when calculation devices are not available. Even with the conveniences of modern life, we occasionally find ourselves without access to our cell phones or other capable devices. A mind skilled in mental math is always available to you.

Finally, getting better at mental math enables a quick estimate and sanity check on results obtained from calculators. While computers are extremely reliable at solving math problems, there is always the risk of incorrectly inputting the problem to the computer. By getting better at mental mathematics, you will develop an intuition for whether the results of calculators make sense.

In fact, the ability to estimate is often sufficient to avoid using calculators altogether. While the use of computers is widespread, estimation is an increasingly valued skill in many industries. There are many situations where complex math will eventually be required, but a preliminary estimate is needed quickly. A major boost to productivity!


Use a Math Trainer

Mental math ability is a lot like physical fitness training. You may be out of shape in the beginning, but with diligent training you can and will improve. Initially you might not enjoy the exercise, but you will reap significant rewards for your effort. As you become more fit, you’ll begin to enjoy the activity much more. If you are serious about it, your mental calculation fitness could become a source of energy, galvanizing you to face the challenges of life with enthusiasm.

In physical training, you break down the fibers in your muscles during a workout session. Your muscles actually sustain tiny tears during resistance training exercises. While you rest afterwards, your body repairs the damage, rebuilding the fibers thicker and stronger.

A similar process is believed to occur for cognitive tasks. A 2016 study found "extensive evidence that brain-training interventions improve performance on the trained tasks".1 Therefore you can expect training your brain to answer mental math questions will lead to improved performance over time.

In the context of physical fitness, a "trainer" often refers to a trained professional who guides the workout and recovery process. Personal trainers are tasked with assessing a trainee's level of ability, prescribing an exercise regimen, and offering feedback as the training goes along. The word "trainer" could also refer to a system that automates the role of a personal trainer. Many aerobic exercise machines today offer interactive training programs with feedback and analysis of a user's performance.

A math trainer is needed for optimal math fitness. Like in physical fitness, the trainer should be compatible with users at a variety of skill levels and should guide them to the next level. It should give an accurate assessment of a user's strengths and weakness, as well as offer helpful feedback on where to focus one's efforts. Learning the ropes of mental maths with a math trainer should be a seamless, rewarding journey to ever-greater abilities.


Mental Calculation

Mental calculation, or mental math, is performing arithmetical calculations without the aid of tools or supplies. As opposed to using a calculator or pencil and paper, mental math is performed entirely in one’s head.

People use mental calculation when computation aides are not available, when it is faster to do so, or when they wish to practice, show off, or participate in mental math competitions. Most people perform basic mental calculation using elementary arithmetic on a daily basis. An inability to calculate mentally is a serious obstacle to many common tasks.

In U.S. schools, mental calculation is taught only for the most elementary arithmetic, such as single-digit addition and multiplication of two numbers between 0 and 12. To solve addition problems involving multiple digits, you are taught to add columns of digits from right to left, carrying the tens digit if the column sum exceeds 9. For example, how would you approach this addition problem?

Example of two-digit
addition problem

If you were trained like many of us were, you’d add the right column to obtain 12. Since that’s two digits, you’d write the 2 under the right column and carry the 10 by writing a 1 above the left column. Finally, you’d add the two tens digits and the carried 1 to obtain the answer, 52.

To solve an addition problem mentally, it’s best to add the columns from left to right. In our example, you could add the tens digit of the second number, 30, to the first number, 14, to obtain 44. This is easier than the full problem because you’re just doing one mental calculation and tacking on the 4 from the 14 as the singles digit. Then you’d add the remaining ones digit of the second number, 8, to 44 to arrive at the answer, 52.

Which approach seems simpler to you? Can you do the first approach without pulling out a pencil and paper? It turns out the same advantages of left-to-right addition apply to much larger numbers as well. It’s unlikely that difficult addition problems can be solved right to left without needing to write it all out, which of course is more time consuming.

Mental math should be distinguished from the memorization of math facts such as multiplication tables. A foundation of memorized answers to simple math problems will make mental math easier, but performing maths in your head requires both memorized facts and the manipulation of numbers and operations to solve problems. This combination of skill and memory allows us to solve far more complex math questions than can be answered with readily-memorized math facts.

Many mental math tricks are specific to particular numbers or types of problems, usually dependent on the base of the number system used. In the decimal numeral system, for example, it is trivially easy to multiply by 10—just add a 0 to the end of the number. This mental math trick wouldn’t work in the hexadecimal numeral system, though, because the base is 16 instead of 10.

Therefore mental calculation is the ability to manipulate complex arithmetic problems in such a way that they can be resolved using simple memorized math facts.


Arithmetic

Arithmetic is the branch of mathematics concerning basic number operations: addition, subtraction, multiplication, and division. As kids, we are taught to do arithmetic because real-world math problems depend on a mastery of elementary arithmetic. Higher-level study of arithmetic and the integers, or whole numbers, is known as number theory.

Though the math kids initially study is arithmetic, the word is rarely used in this context anymore. Originally it comes from the Greek arithmos, meaning “number”. It has however been included in the “three Rs” of elementary Western education: reading, writing, and arithmetic.

There is evidence prehistoric humans were using arithmetic as hunter-gatherers. Archaeologists have uncovered a tally stick, believed to be over 20,000 years old, which may exhibit the earliest known sequences of prime numbers. An understanding of prime numbers, which are only divisible by themselves and the number 1, requires knowledge of the operation in arithmetic known as division.

From tally marks came base-10 numerals such as those used in Egypt over 5,000 years ago. Number systems based on 10 probably arose because humans have ten “digits” as fingers on their hands (or toes on their feet). A later advance in arithmetic was positional notation, which allowed the same symbols to represent different magnitudes depending on their position in the written number. These numeral systems allowed complex arithmetic to be communicated, recorded, and applied to the challenges faced by our ancestors.

The basic operation of arithmetic is addition. It combines two or more numbers into one, the sum of the terms. The terms can be added in any order, which is known as the commutative property of arithmetic. On a number line, the sum of two numbers is the total distance from zero covered by both numbers.

The inverse arithmetical operation of addition is subtraction. It finds the difference between two numbers. Subtraction is not commutative because the order of the numbers determines whether the answer is positive or negative. On a number line, the difference between two numbers is the distance between their positions.

A second basic operation of arithmetic is multiplication, which scales a number by another number. This second number is called a factor. Like addition, multiplication is commutative—you can change the order of the factors and still get the same answer. Multiplication on a number line can be viewed as adding the first number a total number of times equal to the second factor.

Finally, division is an arithmetical operation that is essentially the inverse of multiplication. Rather than scaling a number, it is divided into a number of pieces equal to the second number. Dividing by the number 0 is not defined in arithmetic because dividing something into zero pieces is impossible.

Basic arithmetic allows us to evaluate the answers to an unlimited number of mathematical expressions. Arithmetical expressions can be purely mathematical, as in 2 + 2, or they can represent quantities in the physical world, such as two items plus two more. Understanding the laws of arithmetic is tremendously powerful.


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