(完整word版)一年级数学20以内破十法减法练习题(2)
庸众的胜利-宣誓仪式
18 — 9 = 17
15 — 9 =
14
12 — 9 =
11
16 — 8 =
15
13 — 8 =
12
16 — 7 =
15
20以内破十法减法练习题
凑十法儿歌
一九一九好朋友，
二八二八手拉手。
三七三七真亲密，
四六四六一起走，
五五凑成一双手。
看大数，分小数，
凑成十，加剩数。
大数记心里，小数记手里
— 9 =
16 — 9 =
— 9 =
13 — 9 =
— 9 = 17
— 8 =
— 8 = 14 —
8 =
— 8 = 11 — 8 =
— 7 = 14 — 7 =
1
13
— 7 = 12 — 7 =
11 — 7 =
15 — 6
= 14
12 — 6 = 11
13 — 5 =
12
13 — 4 =
12
12 — 3 =
11
13 — 5 =
12
— 6 =
— 6 = 14
— 5
= 11
— 4 =
— 3 = 11
— 5 =
11
2
13 — 6 =
— 5 =
— 5
=
11 — 4 =
— 2 =
—
5 =
13 — 4 = 12 — 4 =
11 — 4 =
16
— 7 = 15 — 7 =
14 — 7 =
18 —
9 = 17
15 — 9 =
13 — 7 = 12
12 — 9 =
11
16 — 8 =
— 9 =
16
14 — 9 = 13
— 7 = 11
— 9 =
17
15 — 8 = 14
3
— 9 =
— 9 =
— 7 =
—
8 =
— 8 =
13 — 4 =
12 — 4 = 11 — 4 =
12 — 3 =
11 — 3 = 11 — 2 =
13 — 5 =
13 — 8 =
12
16 — 7 =
15
12 — 6 =
15 — 9 =
14
12 — 5 =
11
— 8 = 11
— 7 =
14
11 — 6 = 14
—
9 = 13
4
— 5 =
— 8 =
— 7 =
— 5 =
— 9 =
13 — 4 = 12 — 4 =
11 — 4 =
12
— 3 = 11 — 3 =
11 — 2 =
13 —
5 = 12
13 — 8 = 12
16 — 7 =
12 — 6 = 11
15 — 9 =
14
— 5 =
11
— 8 = 11
15 —
7 = 14
— 6 =
14
— 9 = 13
5
—
5 =
— 8 =
— 7 =
— 5
=
— 9 =
13
— 4 = 12 — 4 =
11 — 4 =
16
— 7 = 15 — 7 =
14 — 7 =
18 —
9 = 17
15 — 9 = 14
13 — 7 =
12
12 — 9 =
11
16 — 8 =
15
— 9 =
16
— 9 = 13
—
7 = 11
— 9 =
17
— 8 = 14
6
—
9 =
— 9 =
— 7 =
— 8 =
— 8 =
13 — 4 = 12 — 4 =
11 — 4 =
16
— 7 = 15 — 7 =
14 — 7 =
18 —
9 = 17
15 — 9 = 14
13 — 7 =
12
12 — 9 =
11
16 — 8 =
15
— 9 =
16
— 9 = 13
—
7 = 11
— 9 =
17
— 8 = 14
7
—
9 =
— 9 =
— 7 =
— 8 =
— 8 =
13 — 4 = 12 — 4 =
11 — 4 =
12
— 3 = 11 — 3 =
11 — 2 =
13 —
5 = 12
13 — 8 = 12
16 — 7 = 15
12 — 6 =
11
15 — 9 =
14
— 5 =
11
— 8 = 11
— 7 =
14
— 6 = 14
— 9
= 13
8
— 5 =
— 8 =
— 7 =
— 5 =
— 9 =
13 — 4
= 12 — 4 = 11
— 4 =
12 — 3
= 11 — 3 = 11
— 2 =
13 — 5
= 12
13 — 8 = 12
16 — 7 = 15
12 — 6 =
11
15 — 9 =
14
— 5 =
11
— 8 = 11
— 7 =
14
— 6 = 14
— 9
= 13
9
— 5 =
— 8 =
— 7 =
— 5 =
— 9 =
13 — 4
= 12 — 4 = 11
— 4 =
16 — 7
= 15 — 7 =
14 — 7 =
18 —
9 = 17
15 — 9 = 14
13 — 7 =
12
12 — 9 =
11
16 — 8 =
15
— 9 =
16
— 9 = 13
—
7 =
— 9 = 17
— 8 = 14
10
— 9
=
— 9 =
11 — 7 =
— 8 =
— 8 =
13 — 4 = 12 — 4
= 11 — 4 =
16 — 7 = 15
— 7 = 14 — 7 =
18 — 9 =
17
15
— 9 =
13 — 7 = 12
12 — 9 = 11
16 — 8 =
— 9 =
16
14 — 9 = 13
— 7 = 11
— 9 =
17
15 — 8 = 14
11
— 9 =
— 9 =
— 7 =
—
8 =
— 8 =
13 — 4 = 12 — 4 =
11 — 4 =
12
— 3 = 11 — 3 =
11 — 2 =
13 —
5 =
13 — 8 = 12
16 — 7 = 15
12 — 6 =
11
15 — 9 =
14
12 — 5 =
11
— 8 = 11
— 7 =
14
— 6 = 14
— 9
= 13
12
— 5 =
— 8 =
— 7 =
— 5 =
— 9 =
13 — 4
= 12 — 4 = 11
— 4 =
12 — 3
= 11 — 3 = 11
— 2 =
13 — 5
= 12
13 — 8 = 12
16 — 7 = 15
12 — 6 =
11
15 — 9 =
14
— 5 =
11
— 8 = 11
— 7 =
14
— 6 = 14
— 9
= 13
13
— 5 =
— 8 =
— 7 =
— 5 =
— 9 =
13 — 4
= 12 — 4 = 11
— 4 =
16 — 7
= 15 — 7 =
14 — 7 =
18 —
9 = 17
15 — 9 = 14
13 — 7 =
12
12 — 9 =
11
16 — 8 =
— 9 =
16
— 9 = 13
—
7 = 11
— 9 =
17
15 — 8 = 14
14
— 9 =
— 9 =
— 7 =
—
8 =
— 8 =
例子：
9 + 9 = 9
+ 8 = 9 + 7 =
巩固练习：
7 + 9 =
7 + 8 = 7 + 7 =
9 + 9 =
9 + 8 = 9 + 7 =
【重点知识二】
破十法：退位减法使用
破十法口诀：看大数，分出10，减小数，加剩数
例子：
18 – 9 =
17 – 9 = 16 – 9 = 15 – 9 =
巩固练习：
17 – 8 = 16 – 8 = 15 – 8
= 14 – 8 =
15
13 – 8 = 12 – 8 =
11 – 8 = 16 – 7 =
提升练习题
一、 口算
12– 6 = 11 – 6 =
14 – 5 = 13 – 5 =
6 + 9 = 6 + 8 =
6 + 7 =
15– 6 =
12 – 6 = 12 – 5 = 17 – 9 =
13– 4= 11 – 5 = 14 – 6 =
16 – 8=
16
15– 9= 18 – 9= 12 – 7=
14 – 9=
13– 7 = 12
– 9 = 11 – 3 = 12 – 5 =
13– 7 = 12 – 9 = 11 – 3 =
16– 9 = 15 – 8 = 13 – 8=
13– 7 = 12 – 9 = 11 – 3 =
17
12 – 5 =
– 6 =
12 – 5 =
11