Addition & subtraction within 20 (Grade 1)
12 + 1 =
18 - 3 =
20 - 2 =
10 - 5 =
15 - 4 =
16 - 7 =
1 + 16 =
13 - 6 =
19 - 10 =
17 - 3 =
8 + 11 =
11 - 7 =
18 - 14 =
6 + 12 =
14 - 4 =
17 + 1 =
11 - 1 =
20 - 3 =
10 + 3 =
16 - 14 =
20 - 16 =
18 - 3 =
3 + 7 =
14 + 4 =
4 + 6 =
18 - 18 =
6 - 2 =
16 - 3 =
20 - 2 =
20 - 9 =
4 - 1 =
15 - 3 =
16 - 3 =
20 - 12 =
16 - 11 =
8 + 7 =
11 - 6 =
4 - 1 =
7 - 1 =
3 - 2 =