Leaderboard
Indonesia
Indonesia
Worldwide
Rank
Level
1
Aryaseto
Jakarta Raya
100
2
Trimitra Mahesa Aditya
Jawa Barat
83
3
Jin Young Bang
Jakarta Raya
81
4
Rangga Puraditama
Banten
78
7
Pochi
Jawa Timur
73
9
User
Riau
66
10
User
Jawa Timur
65
11
User
Yogyakarta
65
12
User
Bali
65
13
Effaitch
Jawa Barat
64
14
Jasondabub
Jakarta Raya
64
15
Ramdhani
Jakarta Raya
63
16
Firdous Bayu
Jawa Timur
63
17
William T
Jakarta Raya
61
18
Clement Runtung
Jakarta Raya
60
20
User
Jakarta Raya
59
21
hirzi hansa
Jakarta Raya
58
22
User
Jakarta Raya
58
23
Keith omg
Jakarta Raya
57
24
Ecclo
Jakarta Raya
55
25
Aryanto Yoga
Jakarta Raya
54
26
User
Jawa Tengah
53
27
User
Jawa Timur
53
28
User
Banten
53
29
User
Yogyakarta
53
30
User
Jawa Timur
52
31
Gallen Ushi
Banten
52
32
M Rafi Fahreza
Jawa Barat
52
33
Rusliana Z
Jakarta Raya
51
34
natanael fransiscos
Jakarta Raya
49
35
User
Jakarta Raya
48
36
Widya
Jakarta Raya
48
37
User
Jawa Tengah
48
38
User
Jakarta Raya
48
39
User
Jakarta Raya
47
40
User
Jakarta Raya
46
41
User
Jawa Barat
45
42
User
Banten
45
43
User
Jawa Tengah
44
44
medici k
Jakarta Raya
43
45
User
Jawa Timur
42
47
User
Jakarta Raya
42
48
User
Jawa Barat
41
50
champawatt
Yogyakarta
39
51
User
Jawa Tengah
38
52
User
Banten
36
53
Belvedere
Jakarta Raya
36
54
User
Jakarta Raya
35
56
User
Jakarta Raya
33
57
User
Jawa Tengah
33
58
User
Jawa Timur
33
59
User
Jakarta Raya
33
60
Iqbal Muhammad
Jakarta Raya
32
61
User
Jakarta Raya
31
62
User
Jakarta Raya
31
63
User
Bali
31
64
User
Jakarta Raya
29
65
User
Jawa Barat
28
67
User
Banten
28
68
User
Jakarta Raya
28
70
User
Jakarta Raya
27
71
Agil Wijaya
Jakarta Raya
27
72
ReveHavan
Jakarta Raya
27
73
User
Jakarta Raya
26
74
User
Jakarta Raya
25
75
User
Jakarta Raya
25
76
User
Banten
24
77
User
Jakarta Raya
24
78
User
Bali
24
79
Anna
Jakarta Raya
23
80
User
Yogyakarta
23
81
User
Jakarta Raya
23
82
User
Jawa Timur
22
83
User
Jawa Timur
22
84
Stanley
Jakarta Raya
22
85
User
Yogyakarta
22
86
Kbyn
Jakarta Raya
22
87
User
Jakarta Raya
22
88
User
Jakarta Raya
22
89
User
Yogyakarta
21
90
User
Jakarta Raya
21
91
User
Jakarta Raya
21
92
User
Jawa Timur
21
93
User
Jakarta Raya
21
94
User
Jakarta Raya
21
95
User
Jawa Barat
21
96
User
Jakarta Raya
21
98
User
Jakarta Raya
20
99
User
Jakarta Raya
20
100
User
Jawa Timur
20
101
User
Jawa Timur
20
102
User
Bali
20
103
User
Jakarta Raya
20
104
User
Jakarta Raya
18
105
User
Jakarta Raya
18
106
User
Jakarta Raya
18
107
Pengunjung
Jakarta Raya
18
108
Fariz Azhar Himawan
Jakarta Raya
18
110
User
Jawa Barat
17
111
User
Jakarta Raya
17
112
Hafif I.
Jawa Barat
16
113
User
Jakarta Raya
16
114
User
Jawa Barat
16
115
User
Bali
16
116
User
Jawa Barat
16
117
User
Jakarta Raya
16
118
User
Jawa Timur
16
119
User
Yogyakarta
16
120
User
Jakarta Raya
15
121
User
Jakarta Raya
15
122
Salma
Jakarta Raya
15
123
User
Jawa Barat
14
124
User
Jawa Timur
14
125
User
Jakarta Raya
14
126
User
Jakarta Raya
14
127
della shafira
Jawa Barat
14
128
User
Jakarta Raya
14
129
Henry Bremridge
Jakarta Raya
14
130
User
Jakarta Raya
14
131
User
Jawa Timur
14
132
User
Jakarta Raya
14
133
User
Jakarta Raya
14
134
User
Jakarta Raya
14
135
User
Jawa Tengah
14
136
User
Jakarta Raya
14
137
User
Jakarta Raya
14
139
User
Jawa Timur
13
140
User
Jawa Timur
13
141
Noname Noname
Jawa Barat
13
142
User
Jakarta Raya
13
143
Casper Velthuijs
Jawa Timur
13
144
User
Jakarta Raya
13
145
User
Bali
13
146
User
Jakarta Raya
13
147
User
Jakarta Raya
13
148
User
Jawa Timur
13
150
APRIYANNTO
Jakarta Raya
13
151
Lil' Creepsty
Jakarta Raya
13
152
User
Banten
12
153
User
Jakarta Raya
12
154
User
Jakarta Raya
12
156
Naufalsaurus
Jawa Timur
12
157
User
Jakarta Raya
12
158
User
Jakarta Raya
12
159
User
Jakarta Raya
12
160
Juan Tombeng
Sulawesi Selatan
12
161
User
Banten
12
162
User
Jakarta Raya
11
163
Deneey
Sumatera Utara
11
164
User
Jakarta Raya
11
165
Muhammad Alif Syahary Putra
Banten
11
166
User
Jakarta Raya
11
167
User
Jakarta Raya
11
168
User
Jawa Timur
11
169
User
Banten
11
171
User
Jawa Barat
11
172
User
Jakarta Raya
11
173
User
Jakarta Raya
10
174
User
Jakarta Raya
10
175
User
Jawa Timur
10
176
User
Jawa Barat
10
177
Jemmico
Jakarta Raya
10
178
User
Jawa Timur
10
179
Aldemart S.Muchtar
Jakarta Raya
10
180
User
Bali
10
181
Nikita K
Jakarta Raya
10
182
User
Yogyakarta
10
183
User
Jakarta Raya
10
184
Cherry Masias
Banten
10
185
Tiffany Ng
Jakarta Raya
9
187
User
Jakarta Raya
9
189
User
Jakarta Raya
9
190
User
Jawa Barat
9
191
User
Jakarta Raya
9
192
User
Jakarta Raya
9
194
User
Riau
8
195
User
Jakarta Raya
8
196
User
Jakarta Raya
8
197
User
Banten
8
198
User
Jakarta Raya
8
199
User
Jakarta Raya
8
200
User
Jawa Barat
8
202
User
Jakarta Raya
8
203
User
Jakarta Raya
8
204
User
Jakarta Raya
8
205
User
Jakarta Raya
8
206
User
Jakarta Raya
8
207
Yurik Yang
Jawa Barat
8
208
User
Jawa Barat
8
209
User
Jawa Tengah
8
210
User
Jakarta Raya
8
211
User
Jakarta Raya
8
212
User
Jakarta Raya
8
213
Van Nesterooy
Sumatera Utara
7
214
User
Jawa Timur
7
215
Al jabar
Jakarta Raya
7
216
Kurt
Jawa Timur
7
217
User
Jakarta Raya
7
218
User
Jakarta Raya
7
219
User
Jakarta Raya
7
220
User
Jawa Barat
7
221
User
Jawa Timur
7
222
User
Jawa Barat
7
223
Lazuardy Fajar
Jakarta Raya
7
225
User
Jakarta Raya
7
226
User
Jakarta Raya
7
227
User
Jakarta Raya
7
228
User
Jakarta Raya
6
229
User
Jawa Tengah
6
230
User
Jakarta Raya
6
231
User
Jawa Barat
6
232
User
Jakarta Raya
6
233
User
Jakarta Raya
6
234
User
Jakarta Raya
6
235
User
Jakarta Raya
6
236
User
Jakarta Raya
6
237
User
Jawa Barat
6
238
User
Jakarta Raya
6
239
User
Banten
6
240
User
Jakarta Raya
6
241
User
Jakarta Raya
6
242
User
Banten
6
243
User
Banten
6
244
User
Jakarta Raya
6
245
User
Jakarta Raya
6
246
User
Jakarta Raya
6
247
User
Jakarta Raya
6
248
User
Jakarta Raya
5
249
User
Jakarta Raya
5
250
User
Jakarta Raya
5
251
Aakriti
Jakarta Raya
5
252
User
Jakarta Raya
5
253
User
Jakarta Raya
5
254
User
Jakarta Raya
5
255
User
Jakarta Raya
5
257
User
Jakarta Raya
5
258
User
Jakarta Raya
5
259
User
Jakarta Raya
5
260
User
Jakarta Raya
5
261
User
Jakarta Raya
5
262
User
Jakarta Raya
5
263
User
Jakarta Raya
5
264
Daniel TEGUH
Jakarta Raya
5
265
User
Jakarta Raya
5
266
User
Region
5
267
User
Jakarta Raya
5
268
User
Jakarta Raya
5
270
User
Jakarta Raya
5
271
Ali Haidir
Jakarta Raya
5
272
User
Jakarta Raya
4
273
User
Jawa Timur
4
274
User
Jawa Timur
4
275
User
Jakarta Raya
4
276
User
Region
4
277
User
Jakarta Raya
4
278
Firdaus Bayu Aji
Jawa Timur
4
279
User
Jakarta Raya
4
280
User
Jawa Tengah
4
281
User
Riau
4
282
Brandon Dennis
Banten
4
283
User
Jakarta Raya
4
284
User
Jakarta Raya
4
285
User
Banten
4
286
Depan Maya
Sumatera Utara
4
287
User
Jawa Tengah
4
288
User
Jawa Timur
4
289
User
Jakarta Raya
4
291
User
Jawa Barat
4
292
User
Jakarta Raya
4
293
User
Jakarta Raya
4
294
User
Jakarta Raya
4
295
User
Jawa Timur
4
296
User
Jakarta Raya
4
297
User
Jakarta Raya
4
298
User
Jakarta Raya
4
299
User
Banten
4
300
User
Jakarta Raya
4
301
User
Jakarta Raya
4
302
User
Jawa Timur
3
303
User
Jakarta Raya
3
304
User
Jakarta Raya
3
305
User
Jakarta Raya
3
307
User
Banten
3
308
User
Jawa Barat
3
309
User
Jakarta Raya
3
310
Maile Widyadari Monteiro Da Rocha
Bali
3
311
User
Jawa Barat
3
312
User
Banten
3
313
User
Jawa Tengah
3
315
User
Jakarta Raya
3
316
User
Jakarta Raya
3
317
User
Bali
3
318
User
Banten
3
319
User
Jakarta Raya
3
320
User
Jawa Barat
3
321
User
Banten
3
322
User
Jakarta Raya
3
323
User
Yogyakarta
3
324
User
Jawa Barat
2
325
User
Jakarta Raya
2
326
User
Yogyakarta
2
327
Raju Septian
Sulawesi Selatan
2
328
User
Jakarta Raya
2
329
User
Jakarta Raya
2
330
User
Banten
2
331
User
Bali
2
332
User
Jawa Timur
2
333
User
Bali
2
334
User
Jawa Timur
2
335
User
Jakarta Raya
2
336
User
Jawa Timur
2
337
User
Jakarta Raya
2
338
User
Yogyakarta
2
339
User
Jawa Barat
2
340
User
Jakarta Raya
2
342
User
Jakarta Raya
2
343
User
Jawa Timur
2
344
User
Jakarta Raya
2
345
User
Jakarta Raya
2
346
M. Hilal Yahya Hidayat
Jawa Timur
2
347
User
Jakarta Raya
2
348
semo joe
Jakarta Raya
2
349
niji niel
Jawa Barat
2
350
Ernesto JR Siagian
Jakarta Raya
2
351
User
Jawa Barat
2
352
User
Jakarta Raya
2
353
User
Region
2
355
User
Jawa Tengah
2
357
User
Jawa Timur
2
358
User
Jakarta Raya
2
359
User
Jakarta Raya
2
360
User
Jakarta Raya
2
361
User
Jakarta Raya
2
362
User
Jawa Barat
2
363
User
Jakarta Raya
2
364
User
Jawa Timur
1
365
User
Jakarta Raya
1
366
User
Jakarta Raya
1
367
User
Jawa Barat
1
368
User
Jakarta Raya
1
369
User
Jakarta Raya
1
370
User
Jakarta Raya
1
372
User
Jakarta Raya
1
374
User
Jawa Timur
1
375
User
Jakarta Raya
1
376
User
Jawa Timur
1
377
User
Jawa Barat
1
378
User
Jawa Barat
1
379
User
Jawa Timur
1
380
User
Jawa Barat
1
381
User
Bali
1
383
User
Jawa Barat
1
385
User
Jakarta Raya
1
386
User
Jakarta Raya
1
387
User
Jakarta Raya
1
388
User
Jakarta Raya
1
389
User
Jakarta Raya
1
390
User
Jawa Barat
1
391
User
Banten
1
392
User
Jakarta Raya
1
393
User
Jakarta Raya
1
394
User
Jakarta Raya
1
396
User
Jakarta Raya
1
397
User
Jawa Barat
1
399
User
Jakarta Raya
1
400
User
Jakarta Raya
1
401
User
Jakarta Raya
1
402
User
Bali
1
403
User
Jakarta Raya
1
404
User
Jakarta Raya
1
405
User
Bali
1
406
User
Jakarta Raya
1
408
User
Jakarta Raya
1
409
User
Jakarta Raya
1
410
User
Jawa Barat
1
411
User
Banten
1
412
User
Jawa Barat
1
413
User
Banten
1
414
User
Riau
1
415
User
Jawa Timur
1
418
User
Jakarta Raya
1
419
User
Riau
1
420
User
Banten
1
421
User
Jakarta Raya
1
422
User
Jakarta Raya
1
423
User
Jakarta Raya
1
424
User
Jawa Timur
1
425
User
Jawa Barat
1
426
User
Jawa Barat
1
427
User
Jawa Barat
1
428
User
Jakarta Raya
1
429
User
Jakarta Raya
1
430
User
Jawa Barat
1
431
User
Jakarta Raya
1
432
User
Jakarta Raya
1
433
Benjamin
Jawa Timur
1
434
User
Jakarta Raya
1
435
User
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 math 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 math, 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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