That is usually called the "remainder".
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The amount left over after a division is the Remainder.
In the calculation below, the Divisor (3) cannot evenly divide into the dividend (7), then there will be a Quotient (2) and a Remainder (1) 7 ÷ 3 = 2, +1 The remainder is the amount left over.
Remain, or remainder, is the amount left over when one number is divided into another, but doesn't divide equally. For example, 25 divided by 6 is 4, with a remainder of 1.
The remainder
We call this left over number the remainder.