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If you count back or subtract the divisor from the dividend then you get the number of groups. For example

12/3 can be done like

12 is the dividend and 3 is the divisor.

12 -3, 9-3, 6-3, 3-3 which will give us 4 groups.

12/5 can be done like

12-5, 7-5 (in this case you get 2 which will be considered as reminder) and 12-5, 7-5 are 2 groups.

Hope this helps.

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Q: How can you use subtraction to find the number of groups made?
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