20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
4 - 0 =
5 - 5 =
1 - 1 =
12 - 0 =
20 - 15 =
17 - 7 =
19 - 13 =
1 - 1 =
5 - 5 =
3 - 1 =
20 - 12 =
17 - 14 =
17 - 17 =
8 - 1 =
15 - 10 =
12 - 10 =
5 - 2 =
8 - 0 =
19 - 5 =
8 - 6 =