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Indonesia
Indonesia
Worldwide
Rank
Level
1
Rangga Puraditama
Banten
98
4
Aryanto Yoga
Jakarta Raya
92
5
Pochi
Jawa Timur
90
7
User
Yogyakarta
88
8
ReveHavan
Jakarta Raya
85
9
Effaitch
Jawa Barat
79
11
Trimitra Mahesa Aditya
Jawa Barat
78
12
Stanley
Jakarta Raya
74
13
User
Jawa Timur
73
14
Ecclo
Jakarta Raya
72
15
User
Yogyakarta
68
16
User
Jawa Tengah
66
17
User
Jakarta Raya
64
18
User
Bali
64
19
User
Jawa Timur
63
20
User
Banten
62
21
Tristy Trist
Sulawesi Selatan
60
23
champawatt
Yogyakarta
58
25
User
Banten
54
26
User
Jakarta Raya
54
27
User
Banten
53
28
Fauzan Hanandito
Jawa Barat
53
29
User
Jawa Tengah
52
30
User
Jawa Barat
50
31
User
Jakarta Raya
50
32
User
Jawa Barat
49
33
Henry Bremridge
Jakarta Raya
49
34
Belvedere
Jakarta Raya
48
35
User
Jakarta Raya
46
37
User
Jawa Tengah
46
38
User
Jawa Timur
45
39
User
Jawa Barat
44
40
User
Yogyakarta
44
41
User
Jawa Timur
44
42
User
Jakarta Raya
44
43
Agil Wijaya
Jakarta Raya
43
44
User
Yogyakarta
43
45
User
Jakarta Raya
43
46
User
Jakarta Raya
42
47
User
Jakarta Raya
42
48
User
Jakarta Raya
42
49
User
Jakarta Raya
41
50
User
Jakarta Raya
41
51
User
Jakarta Raya
39
52
Noname Noname
Jawa Barat
39
53
User
Jawa Timur
39
54
User
Jakarta Raya
37
55
User
Jakarta Raya
36
56
User
Jakarta Raya
35
57
APRIYANNTO
Jakarta Raya
35
58
User
Jakarta Raya
35
59
User
Jakarta Raya
34
60
User
Jakarta Raya
34
61
User
Jakarta Raya
34
63
User
Jakarta Raya
33
64
User
Bali
32
65
User
Yogyakarta
31
66
aan
Riau
31
67
User
Banten
31
68
User
Jawa Barat
30
69
User
Jawa Barat
30
70
User
Jakarta Raya
30
71
Pengunjung
Jakarta Raya
29
72
User
Jawa Timur
29
73
User
Jakarta Raya
29
74
User
Bali
28
75
User
Jakarta Raya
28
76
User
Jakarta Raya
28
77
User
Jakarta Raya
28
78
Jaya Bhaskara
Jawa Barat
28
79
User
Jakarta Raya
28
80
User
Jawa Timur
27
81
User
Jawa Barat
27
82
User
Bali
27
83
User
Jakarta Raya
26
84
User
Jakarta Raya
26
85
User
Jawa Tengah
26
86
User
Jakarta Raya
26
87
User
Banten
26
88
Juan Tombeng
Sulawesi Selatan
26
91
Fariz Azhar Himawan
Jakarta Raya
25
92
User
Jakarta Raya
25
93
User
Jakarta Raya
25
94
User
Jakarta Raya
25
95
User
Jawa Timur
25
96
User
Jakarta Raya
24
97
User
Jakarta Raya
24
98
User
Jakarta Raya
24
99
User
Banten
23
101
User
Jakarta Raya
23
102
User
Jawa Timur
23
103
User
Jakarta Raya
23
104
Casper Velthuijs
Jawa Timur
22
105
Naufalsaurus
Jawa Timur
22
106
User
Jakarta Raya
22
107
User
Jakarta Raya
21
108
User
Jawa Barat
21
109
Deneey
Sumatera Utara
20
110
User
Jawa Timur
20
111
User
Jakarta Raya
20
112
User
Jakarta Raya
20
113
User
Jakarta Raya
20
114
User
Jakarta Raya
20
115
User
Jawa Tengah
19
116
Muhammad Alif Syahary Putra
Banten
19
117
User
Jakarta Raya
19
118
User
Jawa Barat
19
120
Salma
Jakarta Raya
18
121
User
Jakarta Raya
18
122
della shafira
Jawa Barat
18
124
Lil' Creepsty
Jakarta Raya
18
125
User
Jawa Barat
18
126
User
Jakarta Raya
18
127
User
Jakarta Raya
18
128
User
Jawa Timur
17
130
User
Jakarta Raya
17
131
Van Nesterooy
Sumatera Utara
17
132
User
Jakarta Raya
17
133
User
Jakarta Raya
17
135
User
Jakarta Raya
16
137
User
Jakarta Raya
16
138
User
Jakarta Raya
16
139
User
Jakarta Raya
16
140
User
Jakarta Raya
16
141
User
Jakarta Raya
16
143
User
Jakarta Raya
15
144
Nikita K
Jakarta Raya
15
145
User
Jakarta Raya
15
146
Kurt
Jawa Timur
15
147
User
Jakarta Raya
15
148
User
Jakarta Raya
15
149
User
Jawa Timur
15
150
User
Jawa Timur
14
151
User
Jawa Barat
14
152
User
Jakarta Raya
14
153
User
Jawa Tengah
14
154
Jemmico
Jakarta Raya
13
155
Aldemart S.Muchtar
Jakarta Raya
13
156
User
Jakarta Raya
13
157
User
Jakarta Raya
13
158
User
Jakarta Raya
13
159
User
Jawa Barat
13
160
User
Jawa Barat
12
161
User
Yogyakarta
12
162
User
Riau
12
163
User
Jakarta Raya
12
164
User
Jakarta Raya
12
165
User
Jakarta Raya
12
166
User
Jakarta Raya
11
167
User
Jakarta Raya
11
168
User
Jakarta Raya
11
169
User
Jakarta Raya
11
170
User
Jakarta Raya
11
171
User
Jakarta Raya
10
172
User
Jakarta Raya
10
173
User
Jakarta Raya
10
174
Hafif I.
Jawa Barat
10
175
User
Jawa Barat
10
176
User
Jakarta Raya
10
178
User
Jakarta Raya
10
179
User
Jawa Timur
10
180
User
Jakarta Raya
10
181
User
Jakarta Raya
9
182
User
Jawa Tengah
9
183
User
Jawa Timur
9
184
User
Jawa Tengah
8
185
User
Jakarta Raya
8
186
Aakriti
Jakarta Raya
8
187
User
Banten
8
188
User
Jawa Timur
8
189
User
Banten
7
190
User
Jakarta Raya
7
191
User
Jakarta Raya
7
192
User
Jakarta Raya
7
194
Ali Haidir
Jakarta Raya
7
195
User
Jawa Timur
7
196
User
Jawa Tengah
7
197
Depan Maya
Sumatera Utara
7
198
User
Jakarta Raya
7
199
User
Jakarta Raya
7
200
User
Jakarta Raya
7
201
Maile Widyadari Monteiro Da Rocha
Bali
7
202
User
Jakarta Raya
7
203
User
Jawa Barat
7
204
User
Jakarta Raya
7
205
User
Jakarta Raya
7
206
User
Jakarta Raya
6
207
User
Region
6
208
User
Jakarta Raya
6
209
User
Jakarta Raya
6
210
Brandon Dennis
Banten
6
211
User
Jawa Timur
6
212
User
Jakarta Raya
6
213
User
Jawa Tengah
6
214
User
Jawa Timur
6
215
User
Bali
6
216
User
Jakarta Raya
6
218
User
Jawa Timur
5
219
User
Jakarta Raya
5
220
User
Jakarta Raya
5
221
User
Jakarta Raya
5
222
User
Jakarta Raya
5
223
User
Jakarta Raya
5
224
User
Banten
5
226
User
Jakarta Raya
5
227
User
Banten
5
228
User
Yogyakarta
5
229
User
Yogyakarta
5
230
User
Jakarta Raya
5
231
User
Jakarta Raya
5
232
User
Jawa Barat
5
233
User
Jawa Barat
4
235
User
Bali
4
236
User
Jakarta Raya
4
237
User
Banten
4
238
User
Bali
4
239
User
Jawa Timur
4
240
User
Yogyakarta
4
242
User
Jawa Timur
4
243
User
Jawa Timur
4
244
User
Jawa Timur
4
245
User
Jakarta Raya
3
246
User
Jakarta Raya
3
247
User
Jawa Timur
3
248
M. Hilal Yahya Hidayat
Jawa Timur
3
249
User
Jakarta Raya
3
250
User
Jakarta Raya
3
251
semo joe
Jakarta Raya
3
252
User
Jawa Barat
3
253
User
Jakarta Raya
3
254
User
Jakarta Raya
3
255
User
Jakarta Raya
3
256
User
Jakarta Raya
3
257
User
Jakarta Raya
3
258
User
Jakarta Raya
3
259
User
Jakarta Raya
3
260
User
Jakarta Raya
3
261
User
Bali
3
263
User
Jakarta Raya
3
264
User
Jakarta Raya
3
265
User
Jakarta Raya
3
267
User
Bali
3
268
User
Jakarta Raya
3
269
User
Jakarta Raya
3
270
User
Jakarta Raya
2
271
User
Jawa Barat
2
272
User
Jawa Timur
2
273
User
Jawa Barat
2
275
User
Jawa Timur
2
276
User
Jawa Barat
2
277
User
Jakarta Raya
2
278
User
Bali
2
279
User
Jakarta Raya
2
280
User
Jakarta Raya
2
282
User
Banten
2
283
User
Banten
2
285
User
Jawa Timur
2
286
User
Jakarta Raya
2
287
User
Jakarta Raya
2
288
User
Jakarta Raya
2
289
User
Jakarta Raya
2
290
User
Jawa Barat
2
291
User
Jakarta Raya
2
292
User
Jakarta Raya
2
293
User
Jawa Timur
2
294
User
Jawa Timur
2
295
User
Jakarta Raya
2
296
User
Jakarta Raya
2
297
User
Jawa Barat
1
298
User
Riau
1
299
User
Jawa Timur
1
301
User
Jakarta Raya
1
302
User
Riau
1
303
User
Banten
1
304
User
Jakarta Raya
1
305
User
Jakarta Raya
1
306
User
Jakarta Raya
1
307
User
Jawa Barat
1
308
User
Jawa Barat
1
309
User
Jawa Barat
1
310
User
Jakarta Raya
1
311
User
Jakarta Raya
1
312
User
Jawa Barat
1
313
User
Jakarta Raya
1
314
User
Jakarta Raya
1
315
Benjamin
Jawa Timur
1
316
Sayakhmad Olimov
Jakarta Raya
1
317
Leandro Magsakay
Jakarta Raya
1

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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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