20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
4 - 4 =
9 - 5 =
11 - 9 =
20 - 2 =
2 - 2 =
17 - 6 =
6 - 5 =
3 - 0 =
8 - 3 =
8 - 2 =
8 - 7 =
13 - 1 =
13 - 6 =
17 - 3 =
17 - 4 =
2 - 2 =
5 - 4 =
10 - 4 =
20 - 20 =
13 - 5 =