List questions from recreational-mathematics

Published on 12 Apr 2026 - 16:49

774

Views

My friend's challenge: prove that $\sqrt {\frac {a^2+b^2}{ab+1}} \in \mathbb N$

Published on 14 Apr 2026 - 13:11

37

Views

How many percent of the three digit numbers belong to the set $S = 3(70m+37n)$

Published on 13 Apr 2026 - 20:36

89

Views

Sophia washes pots in 30 minutes. Her mother takes 15 minutes to wash them. How much time will it take if they wash them together?

Published on 15 Apr 2026 - 17:55

214

Views

A problem on combinatorics, boxes and dispositions

Published on 15 Apr 2026 - 5:53

1.4k

Views

Fitting a piece of furniture through a corridor

Published on 11 Apr 2026 - 19:32

2.9k

Views

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

Published on 13 Apr 2026 - 21:50

225

Views

finding the periods of miniships in the Burning Ship

Published on 14 Apr 2026 - 12:19

413

Views

How do you calculate the odds of catching a cold from a person who interacted with someone that has a chance of already having a cold?

Published on 14 Apr 2026 - 22:09

152

Views

Some infinite series (just for fun!)

Published on 16 Apr 2026 - 8:22

465

Views

What is the value of $\arctan \left(\frac xy\right) +\arctan \left(\frac yx\right)?$

Published on 14 Apr 2026 - 19:05

105

Views

Elementary geometry problem

Published on 12 Apr 2026 - 21:08

1.3k

Views

Is Conway's "Look and Say Sequence" strictly increasing?

Published on 12 Apr 2026 - 16:56

400

Views

Sliding scale discounts formula

Published on 09 Apr 2026 - 15:26

285

Views

Product of 2-digit numbers

Published on 13 Apr 2026 - 23:09

List Question

At least how many consecutive numbers should be taken?

My friend's challenge: prove that $\sqrt {\frac {a^2+b^2}{ab+1}} \in \mathbb N$

How many percent of the three digit numbers belong to the set $S = 3(70m+37n)$

Sophia washes pots in 30 minutes. Her mother takes 15 minutes to wash them. How much time will it take if they wash them together?

A problem on combinatorics, boxes and dispositions

Fitting a piece of furniture through a corridor

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

finding the periods of miniships in the Burning Ship

How do you calculate the odds of catching a cold from a person who interacted with someone that has a chance of already having a cold?

Some infinite series (just for fun!)

What is the value of $\arctan \left(\frac xy\right) +\arctan \left(\frac yx\right)?$

Elementary geometry problem

Is Conway's "Look and Say Sequence" strictly increasing?

Sliding scale discounts formula

Product of 2-digit numbers

Trending Questions

Popular # Hahtags

Popular Questions