ABCDEFGHIJK
1
2
3
Know the basic addition and subtraction facts
4
5
Add another number to the following to make 20.
6
e.g)14=6
7
8
1)12=
9
2)9=
10
3)12=
11
4)4=
12
5)6=
13
6)15=
14
7)9=
15
16