Addition to 20
1 + 1 =
2
8 - 8 =
0
1 + 2 + 1 =
4
Count by 1s :
0, 1, 2, ___
3
10 + 10 =
20
3 + 5 =
8
17 - 10 =
7
6 + 5 +8 =
19
Count by 2s:
8, 10, 12, ____
14
16 + 5 =
21
12 + 7 =
19
2
6 + 8 + 3 =
17
Count by 5s:
15, 20, 25 ____
30
12 + 24 =
36
16 + 4 =
20
16 - 8 =
8
1 + 14 + 11 =
26
Count by 10s:
30, 40, 50, ____
60
14 + 8 =
22
7 + 9 =
16
18 - 10=
8
11 + 9 + 8 =
28
Count by 4s:
12, 15, 18, ____
21
80 + 50 =
130