Question

Multiplication tables: up to what number should I memorise?

score 1.6k · Answer 1 · 2026-03-23 07:20:25

1.6k

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Multiplication tables: up to what number should I memorise?

Published on 23 Mar 2026 - 7:20

score 2.8k · Answer 2 · 2026-03-22 20:51:03

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 22 Mar 2026 - 20:51

score 334 · Answer 3 · 2026-03-23 10:37:52

334

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 23 Mar 2026 - 10:37

score 334 · Answer 4 · 2026-03-23 01:04:16

334

Views

Generating "random" mental calculation exercises?

Published on 23 Mar 2026 - 1:04

score 316 · Answer 5 · 2026-03-22 14:10:17

316

Views

Age questions: How to approach solving this?

Published on 22 Mar 2026 - 14:10

score 957 · Answer 6 · 2026-03-22 15:39:58

957

Views

Vinculum number of 989?

Published on 22 Mar 2026 - 15:39

score 1.3k · Answer 7 · 2026-03-23 12:05:00

1.3k

Views

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

Published on 23 Mar 2026 - 12:05

score 118 · Answer 8 · 2026-02-23 08:00:31

118

Views

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

Published on 23 Feb 2026 - 8:00

score 112 · Answer 9 · 2026-03-20 00:39:44

112

Views

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

Published on 20 Mar 2026 - 0:39

score 91 · Answer 10 · 2026-03-23 02:28:07

91

Views

Estimating square numbers

Published on 23 Mar 2026 - 2:28

score 164 · Answer 11 · 2026-03-25 05:25:05

164

Views

Efficient modular reduction of integers in radix representation

Published on 25 Mar 2026 - 5:25

score 411 · Answer 12 · 2026-03-25 07:28:37

411

Views

Mental techniques for large arithmetic and decimals

Published on 25 Mar 2026 - 7:28

score 1k · Answer 13 · 2026-03-22 16:35:49

1k

Views

How do you calculate bitwise XOR in your head?

Published on 22 Mar 2026 - 16:35

score 82 · Answer 14 · 2026-03-23 03:33:44

82

Views

Can a mental calculator plot any function in seconds?

Published on 23 Mar 2026 - 3:33

score 236 · Answer 15 · 2026-03-22 22:47:05

236

Views

are combinatorics-leaning mathematicians very good at mental math?

Published on 22 Mar 2026 - 22:47

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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