1、 20以内减法借十法练习题 口诀: 进位加法(凑十法口诀:看大数,分小数,凑成十,算得数) 退位减法(破十法口诀:看大数,分出10,减小数,加剩数) 如嫌题目太少可更改数字 7 例:15 — 8 = 5 10 2 (一) 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 =
2、 13 — 9 = 12 — 9 = 11 — 9 = 17 — 8 = (二) 16 — 8 = 15 — 8 = 14 — 8 = 13 — 8 = 12 — 8 = 11 — 8 =
3、 16 — 7 = 15 — 7 = 14 — 7 = 13 — 7 = 12 — 7 = 11 — 7 = 15 — 6 = 14 — 6 = 13 — 6 = 12 — 6
4、 = 11 — 6 = 14 — 5 = (三) 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 =
5、 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = (四) 18
6、 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 1
7、1 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = (五) 12 — 3 = 11 — 3 = 11
8、 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 =
9、 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = (六) 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 =
10、 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12
11、— 6 = 11 — 6 = 14 — 5 = (七) 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7
12、 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 1
13、1 — 7 = (八) 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7
14、 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = (九) 13 — 7 =
15、 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 —
16、 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = (十) 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 =
17、 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 =
18、 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = (十一) 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16
19、 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 =
20、 11 — 4 = (十二) 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 1
21、3 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = (十三) 13 —
22、 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 1
23、4 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = (十四) 16 — 8 = 15 — 8 = 14
24、 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 =
25、 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = (十五) 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 =
26、 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 1
27、3 — 8 = 12 — 8 = 11 — 8 = (十六) 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9
28、 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 =
29、 (十七) 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 17






