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Use repeated subtraction to divide

Repeated subtraction represents division by removing equal groups of the divisor from a dividend; the number of complete subtractions is the quotient, and any amount left is the remainder, which must be less than the divisor. A number line or equal-groups model makes clear that division asks how many groups fit or how many are in each group, and connects to multiplication as an inverse operation. The scope is whole-number dividends within 100 and one-digit divisors, not larger-number algorithms or generalized division.

Detailed Explanation: Use repeated subtraction to divide

Repeated subtraction means taking away equal groups of the divisor until you cannot take away another complete group.

Example: Find 17÷417 \div 4.

The divisor is 44, so subtract groups of 44 from 1717:

17−4=1317-4=13

That is 1 group of 44.

13−4=913-4=9

That is 2 groups of 44.

9−4=59-4=5

That is 3 groups of 44.

5−4=15-4=1

That is 4 groups of 44.

Now 11 is left. We cannot subtract another 44 because 11 is less than 44.

So, 1717 has 4 complete groups of 44, with 1 left over:

17÷4=4 R117 \div 4=4\text{ R}1

The quotient is 44, and the remainder is 11. Check that the remainder is less than the divisor: 1<41<4.

Learn by doing: Use repeated subtraction to divide

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Division as Fraction - With Remainder 2 x 1


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