I. Fact Families
-
8 + 6 =
14 − 8 =
6 + = 14 14 − = 6 -
10 + = 15
15 − 5 =
15 = + 5 − 10 = 5 - 9 + = 18 18 − = 9
- Why does the fact family for Question C have only two facts?