20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
3 - 1 =
12 - 7 =
6 - 2 =
8 - 7 =
12 - 3 =
7 - 4 =
3 - 2 =
10 - 8 =
12 - 6 =
2 - 1 =
2 - 1 =
2 - 2 =
7 - 0 =
16 - 0 =
19 - 11 =
8 - 3 =
3 - 3 =
12 - 8 =
5 - 1 =
2 - 0 =