New posts in Decimal Expansion

Why are the last two digits of a perfect square never both odd?

Quick doubt on converting a decimal to a fraction

Why a $20$ digit number starting with eleven $1$'s cannot be a perfect square?

Relating the base-p periodic expansion of a rational to its p-adic representation

Show that there are infinitely many powers of two starting with the digit 7

How many pairs of numbers are there so they are the inverse of each other and they have the same decimal part?

Is there any mathematical reason for this "digit-repetition-show"?

If $a+b=10^{50}$ then show $10|a$

How do we know that Cantor's diagonalization isn't creating a different decimal of the same number?

Why do some divisibility rules work only in base 10?