Fact Families

See that 7 + 5 = 12, 5 + 7 = 12, 12 − 5 = 7, and 12 − 7 = 5 belong together.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 4

Some numbers belong together, like a family. 7, 5, and 12 are a fact family: 7 and 5 make 12.
They make two adding facts: 7 plus 5 is 12, and 5 plus 7 is 12.
And two taking-away facts: 12 minus 5 is 7, and 12 minus 7 is 5.
Four facts, one family! The biggest number is the whole. The other two are the parts.
If you know one fact, you know the whole family. 9 plus 4 is 13, so 13 minus 4 is 9!

Georgia's K-12 Mathematics Standards:

2.NR.2.1 — Fluently add and subtract within 20 using a variety of mental, part-whole strategies.