Key Idea1 of 3
Subtraction Uses the Whole
In subtraction, we always start with the whole and take away one part. For the family 3, 5, 8: 8 - 3 = 5 and 8 - 5 = 3. The whole is always the first number in a subtraction fact.
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Mathematics — Fact Families: Related Addition and Subtraction
In subtraction, we always start with the whole and take away one part. For the family 3, 5, 8: 8 - 3 = 5 and 8 - 5 = 3. The whole is always the first number in a subtraction fact.