List questions from decimal-expansion

Published on 07 Mar 2016 - 16:32

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The last two digits of $13^{1010}$.

Published on 27 Mar 2026 - 16:55

447

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Show that every rational number $q\in\mathbb{Q}, q\in [0,1]$ has an eventually repeating ternary expansion.

Published on 10 Mar 2016 - 17:17

74

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How to find if $n$th root of $m$ is rational?

Published on 26 Mar 2026 - 22:15

957

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Why does dividing a number with $n$ digits by $n$ $9$'s lead to repeated decimals?

Published on 14 Mar 2016 - 1:43

2.8k

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How can never ending decimal numbers represent finite lengths? e.g. $\pi$, $\sqrt{2}$

Published on 30 Mar 2026 - 12:25

371

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Who is Petrick from Petrick's method?

Published on 21 Mar 2016 - 10:53

1k

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How to prove that every power of 6 ends in 6?

Published on 27 Mar 2026 - 22:04

153

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ab = a/b = b/a, what's this symmetry called?

Published on 27 Mar 2026 - 22:02

743

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How to prove $\limsup_{n \to \infty} |\sin(n)| = 1$?

Published on 31 Mar 2016 - 12:45

98

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Decimal expansions and topological connectedness

Published on 06 Apr 2016 - 1:09

256

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Last digit of a number

Published on 09 Apr 2016 - 10:23

65

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Theorem on Repeating Decimals

Published on 27 Mar 2026 - 4:15

39

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Get first digits of a very large quotient

Published on 18 Apr 2016 - 7:03

128

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Is $1.0000...$ ( $1$ with infinite zeros) greater than $1.0$?

Published on 26 Apr 2016 - 8:36

List Question

Last $m$ digits of a sum

The last two digits of $13^{1010}$.

Show that every rational number $q\in\mathbb{Q}, q\in [0,1]$ has an eventually repeating ternary expansion.

How to find if $n$th root of $m$ is rational?

Why does dividing a number with $n$ digits by $n$ $9$'s lead to repeated decimals?

How can never ending decimal numbers represent finite lengths? e.g. $\pi$, $\sqrt{2}$

Who is Petrick from Petrick's method?

How to prove that every power of 6 ends in 6?

ab = a/b = b/a, what's this symmetry called?

How to prove $\limsup_{n \to \infty} |\sin(n)| = 1$?

Decimal expansions and topological connectedness

Last digit of a number

Theorem on Repeating Decimals

Get first digits of a very large quotient

Is $1.0000...$ ( $1$ with infinite zeros) greater than $1.0$?

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