New posts in arithmetic

Why does every number of shape ababab is divisible by $13$?

Does the negative apply before or after an exponent

The structure of countable ordinals

Numbers from $1$ to $n$ are permuted such that the sum of any three consecutive numbers is divisible by the leftmost of them

Turning a Piecewise Function into a Single Continuous Expression

Six of a kind .

Identities like $4+5+6=7+8$ and $10^2+11^2+12^2=13^2+14^2$ and so on...

If a finite set tiles the integers, must it be an arithmetic progression?

What is the standard interpretation of order of operations for the basic arithmetic operations?

Reverse Engineer from digits sum

Is long division the most optimal "effective procedure" for doing division problems?

Recommend books for learning math from elementary school?

What area of mathematics would the "24 game" encompass? [closed]

Why is it that $\frac ab\times\frac1c=\frac a{bc}$? [duplicate]

Building the integers from scratch (and multiplying negative numbers)

Why do remainders show cyclic pattern?

Why do we invert then multiply when dividing fractions?

How can we define the notion of multiplication without numbers? [closed]

What is this type of math notation called? (+ 4 5)

Solving an equality with 3 equations, and 3 variables