remainder
The number left over in a division problem is called the "remainder".
its the number left over
quotient
remainder
The left over number or numbers
the remainder
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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.
the number that is left over in a division in which one quantity does not exactly divide another