20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
17 - 0 =
12 - 2 =
15 - 14 =
7 - 2 =
2 - 0 =
15 - 4 =
7 - 0 =
17 - 13 =
1 - 0 =
12 - 2 =
12 - 7 =
15 - 3 =
14 - 9 =
9 - 6 =
14 - 1 =
8 - 1 =
13 - 0 =
7 - 7 =
19 - 4 =
13 - 13 =