Learn the Fact Families for Doubles.
Review Fact Families for 10.
0 + 0 = 0
0 – 0 = 0
1 + 1 = 2
2 – 1 = 1
2 + 2 = 4
4 – 2 = 2
3 + 3 = 6
6 – 3 = 3
4 + 4 = 8
8 – 4 = 4
5 + 5 = 10
10 – 5 = 5
6 + 6 = 12
12 – 6 = 6
7 + 7 = 14
14 – 7 = 7
8 + 8 = 16
16 – 8 = 8
9 + 9 = 18
18 – 9 = 9
10 + 10 = 20
20 – 10 = 10
Remember! Learn = rapid or instant recall
