List questions from decimal-expansion

Published on 24 Feb 2026 - 4:41

240

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Proof for decimal expansions

Published on 13 Oct 2020 - 15:24

166

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Show that for an integer $n \ge 2$, the period of the decimal expression for the rational number $\frac{1}{n}$ is at most $n-1$.

Published on 14 Oct 2020 - 4:28

145

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Find the least positive integer $n$ such that the two digits on the left of $n^{12}$ are equal

Published on 15 Oct 2020 - 12:25

42

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How many digits does $x\in \mathbb{Z}$ have if it satisfies $|x|<10$ in base ten?

Published on 15 Oct 2020 - 21:15

500

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A property of digital sum

Published on 16 Oct 2020 - 5:40

96

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is the number of digits in the decimal expansion of $2^x$ periodic?

Published on 23 Feb 2026 - 4:24

333

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why does ...999 apparently equal -1? is this notation valid?

Published on 21 Oct 2020 - 18:21

91

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Define an injection $(0,1)^2\rightarrow(0,1)$

Published on 22 Oct 2020 - 0:34

108

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Do the digits of $\sum_{k=0}^n20^k$ repeat?

Published on 22 Oct 2020 - 3:12

411

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Why is pi non-repeating?

Published on 22 Oct 2020 - 11:16

404

Views

What does "d-" in decimal number mean

Published on 23 Oct 2020 - 18:57

258

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Calculating Square root of decimal number manually.

Published on 25 Oct 2020 - 17:09

128

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Why are repeating decimals often self-inversions?

Published on 27 Oct 2020 - 0:26

407

Views

Last digit in $\sum_{k=1}^{999}k^m$ (olympiad question)

Published on 27 Oct 2020 - 7:31

List Question

Why does the the binary expansion of $x$ shift left two decimals for $1-x$?

Proof for decimal expansions

Show that for an integer $n \ge 2$, the period of the decimal expression for the rational number $\frac{1}{n}$ is at most $n-1$.

Find the least positive integer $n$ such that the two digits on the left of $n^{12}$ are equal

How many digits does $x\in \mathbb{Z}$ have if it satisfies $|x|<10$ in base ten?

A property of digital sum

is the number of digits in the decimal expansion of $2^x$ periodic?

why does ...999 apparently equal -1? is this notation valid?

Define an injection $(0,1)^2\rightarrow(0,1)$

Do the digits of $\sum_{k=0}^n20^k$ repeat?

Why is pi non-repeating?

What does "d-" in decimal number mean

Calculating Square root of decimal number manually.

Why are repeating decimals often self-inversions?

Last digit in $\sum_{k=1}^{999}k^m$ (olympiad question)

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