New posts in Decimal Expansion

How do you calculate how many decimal places there are before the repeating digits, given a fraction that expands to a repeating decimal?

Last digits of power towers $7$, $7^7$, $7^{7^7}$, $7^{7^{7^7}}$, ... don't change, and generalisation

Find the last two digits of $3^{45}$

Prove that 2.101001000100001... is an irrational number.

Biggest powers NOT containing all digits.

Proving number of digits d to represent integer n in base B?

Prove that $\lfloor0.999\dots\rfloor= ?$ $0$ or $1$?

Is the number $0.112358132134...$ rational or irrational?

Is it possible to have multiple decimal points in a number?

HINT for summing digits of a large power