20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
0 - 0 =
8 - 3 =
7 - 1 =
14 - 5 =
18 - 4 =
7 - 3 =
19 - 17 =
3 - 3 =
12 - 4 =
16 - 14 =
1 - 0 =
0 - 0 =
5 - 5 =
15 - 10 =
1 - 1 =
2 - 2 =
19 - 9 =
18 - 13 =
12 - 1 =
9 - 5 =