Fact Families 1st Grade

Fact Families1st Grade Friday, November 14, 2014 Ms. Butler

Definition • Four math problems -Two addition sentences -Two subtraction sentences • Use the same three numbers

Addition Sentences 2, 3, 5 2+3=5 What number is first? 3+2=5 What number is first? Are the same numbers used?

Subtraction Sentences 2, 3, 5 5-2=3 5-3=2 What number is first in both sentences? How are the sentences different? Are the same numbers used?

Now You Try! What two addition sentences can you write for these three numbers? • 8 5

If you said……….. 3 + 5 = 8 or 5 + 3 = 8 Then you were correct! Give yourself a round of applause!!!!!!

Now You Try! What two subtraction sentences can you write for these three numbers? • 8 5

If you said……….. 8 – 5 = 3 or 8 – 3 = 5 Then you were correct! Give yourself a round of applause!!!!!!

Let’s Review A fact family: • uses the same three numbers • has two addition sentences • has two subtraction sentences

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