Question

Multiplication tables: up to what number should I memorise?

score 1.6k · Answer 1 · 2026-05-07 14:43:06

1.6k

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Multiplication tables: up to what number should I memorise?

Published on 07 May 2026 - 14:43

score 2.8k · Answer 2 · 2026-05-10 12:00:35

2.8k

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How to find a volume of this figure (which is $3080 \text{ cm}^3$) in a few seconds?

Published on 10 May 2026 - 12:00

score 338 · Answer 3 · 2026-05-03 12:43:56

338

Views

How many zeros will $ 3^{3}4^{4}5^{5}6^{6} - 3^{6}4^{5}5^{4}6^{3}$ ends with?

Published on 03 May 2026 - 12:43

score 339 · Answer 4 · 2026-05-02 09:46:38

339

Views

Generating "random" mental calculation exercises?

Published on 02 May 2026 - 9:46

score 323 · Answer 5 · 2026-05-03 00:18:21

323

Views

Age questions: How to approach solving this?

Published on 03 May 2026 - 0:18

score 963 · Answer 6 · 2026-05-03 11:33:58

963

Views

Vinculum number of 989?

Published on 03 May 2026 - 11:33

score 1.3k · Answer 7 · 2026-04-30 04:47:53

1.3k

Views

What method for mentally computing 2-digit multiplication problems, minimizes the amount of mental steps?

Published on 30 Apr 2026 - 4:47

score 128 · Answer 8 · 2026-05-02 13:04:19

128

Views

Mental approximations of 1) log, 2) non-integer power

Published on 02 May 2026 - 13:04

score 116 · Answer 9 · 2026-04-26 10:49:00

116

Views

What would be the best way to memorize the 10 by 10 multiplication table?

Published on 26 Apr 2026 - 10:49

score 98 · Answer 10 · 2026-05-07 11:07:15

98

Views

Estimating square numbers

Published on 07 May 2026 - 11:07

score 168 · Answer 11 · 2026-05-03 05:18:44

168

Views

Efficient modular reduction of integers in radix representation

Published on 03 May 2026 - 5:18

score 415 · Answer 12 · 2026-05-07 12:03:55

415

Views

Mental techniques for large arithmetic and decimals

Published on 07 May 2026 - 12:03

score 1k · Answer 13 · 2026-04-20 03:52:03

1k

Views

How do you calculate bitwise XOR in your head?

Published on 20 Apr 2026 - 3:52

score 85 · Answer 14 · 2026-04-21 01:26:03

85

Views

Can a mental calculator plot any function in seconds?

Published on 21 Apr 2026 - 1:26

score 240 · Answer 15 · 2026-05-07 04:29:24

240

Views

are combinatorics-leaning mathematicians very good at mental math?

Published on 07 May 2026 - 4:29

List Question

Multiplication tables: up to what number should I memorise?

How to find a volume of this figure (which is $3080 \text{ cm}^3$) in a few seconds?

How many zeros will $ 3^{3}4^{4}5^{5}6^{6} - 3^{6}4^{5}5^{4}6^{3}$ ends with?

Generating "random" mental calculation exercises?

Age questions: How to approach solving this?

Vinculum number of 989?

What method for mentally computing 2-digit multiplication problems, minimizes the amount of mental steps?

Mental approximations of 1) log, 2) non-integer power

What would be the best way to memorize the 10 by 10 multiplication table?

Estimating square numbers

Efficient modular reduction of integers in radix representation

Mental techniques for large arithmetic and decimals

How do you calculate bitwise XOR in your head?

Can a mental calculator plot any function in seconds?

are combinatorics-leaning mathematicians very good at mental math?

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