remainder
The number left over in division is called the remainder.
its the number left over
quotient
remainder
The left over number or numbers
top
the remainder
The amount left over after a division is the Remainder.
remainder
a number that is left after division has been completed.
Your question isn't fully clear, but if you are referring to the process of division of numbers, the "number left over" is called a remainder.
It is the remainder when you perform division with any two numbers in mathematics.