loading【 练 习 题. 一 】 （凑 十 法）
9 + 6 = 9 + 5 = 9 + 4 =
9 + 3 = 9 + 2 = 9 + 7 =
9 + 8 = 9 + 9 = 8 + 8 =
8 + 7 = 8 + 9 = 8 + 6 =
8 + 5 = 8 + 4 = 8 + 3 =
7 + 9 = 7 + 8 = 7 + 7 =
7 + 6 = 7 + 4 = 7 + 5 =
6 + 9 = 6 + 8 = 6 + 7 =
6 + 6 = 6 + 5 =
5 + 8 = 5 + 7 = 5 + 6 =
4 + 9 = 4 + 8 = 4 + 7 =
3 + 9 = 3 + 8 = 2 + 9 = 18 4= – 9 =
14 – 9 = 5 + 9 =
【 练 习 题. 二 】 （破十法）
17 – 9 = 16 – 9 = 15 – 9 = – 9 = 12 – 9 = 11 – 9 = 11 – – 3 13 12 =
17 – 8 = 16 – 8 = 15 – 8 = 14 – 8 = 11 – 3 =
13 2 = – 8 = 12 – 8 = 11 – 8 = 16 – 7 =
15 – 7 = 14 – 7 = 13 – 7 = 12 – 7 =
11
4=
– 7 = 15 – 6 = 14 – 6 = 13 – 6 =
124= – 6 = 11 – 6 = 14 – 5 = 13 – 5 =
【 练 习 题. 三 】 （20以内退位减法）
破十法口诀：看大数，分出10；减小数，加剩数。
15 － 6 = 12 － 5 = 17 － 9 =
13 － 4 = 11 － 5 = 14 － 7 = 11 – – 5 =
12 – 13 – 11
16 － 8 = 15 － 9 = 18 － 9 =
12 － 7 = 14 － 9 = 13 － 7 =
12 － 9 = 11
16 － 9 = 15
11 － 6 = 13
13 － 9 = 17
1. 拆小数，凑大数
9 + 9 = 9 + 8 = 9 + 7 =
9 + 6 = － 3 = 12 － 8 = 13 － 4 = 14 － 8 = 14
【 练 习 题. 四 】－ 4 = － 8 = － 5 = － 6=
（凑十法） 9 + 5 = 9 + 4 =
9 + 3 = 9 + 2 = 8 + 8 =
8 + 7 = 8 + 6 = 8 + 5 =
8 + 4 = 8 + 3 = 7 + 7 =
7 + 6 = 7 + 5 = 7 + 4 =
6 + 6 = 6 + 5 = 2. 拆大数，凑小数 9 + 9 = 8 + 9 = 7 + 9 =
6 + 9 = 5 + 9 = 4 + 9 =
3 + 9 = 2 + 9 = 8 + 8 =
练 习 题. 五 】
【 （凑十法）