小学100以内加减法
小学100以内加减法
对于小学100以内的加减法,这里有一些基础练习和口诀帮助你掌握:
加法口诀(不进位)
```
6 + 4 = 10
3 + 11 = 14
7 + 1 = 8
8 + 11 = 19
16 + 1 = 17
4 + 12 = 16
12 + 2 = 14
3 + 12 = 15
12 + 6 = 18
3 + 16 = 19
4 + 4 = 8
8 + 2 = 10
8 - 5 = 3
6 + 1 = 7
10 - 10 = 0
8 - 6 = 2
10 - 4 = 6
1 + 9 = 10
9 - 9 = 0
5 - 4 = 1
6 + 1 = 7
9 - 1 = 8
14 - 3 = 11
```
减法口诀(不退位)
```
39 + 35 - 40 = 34
32 - 23 + 56 = 65
17 + 48 - 37 = 28
26 + 23 + 11 = 60
12 + 15 + 19 = 46
69 - 32 - 17 = 20
57 + 23 - 62 = 18
57 + 23 - 48 = 32
57 + 23 - 72 = 9
72 - 57 + 18 = 33
72 - 57 + 48 = 63
72 - 48 + 18 = 42
100 - 28 + 35 = 107
23 + 47 - 28 = 42
28 + 24 - 16 = 36
```
进位加法口诀
```
加9要减1
加8要减2
加7要减3
加6要减4
加5要减5
加4要减6
加3要减7
加2要减8
加1要减9
```
不退位减法口诀
```
减9要加1
减8要加2
减7要加3
减6要加4
减5要加5
减4要加6
减3要加7
减2要加8
减1要加9
```
练习题目
```
39 + 35 - 40 = 34
32 - 23 + 56 = 65
17 + 48 - 37 = 28
26 + 23 + 11 = 60
12 + 15 + 19 = 46
69 - 32 - 17 = 20
57 + 23 - 62 = 18
57 + 23 - 48 = 32
57 + 23 - 72 = 9
72 - 57 + 18 = 33
72 - 57 + 48 = 63
72 - 48 + 18 = 42
100 - 28 + 35 = 107
23 + 47 - 28 = 42
28 + 24 - 16 = 36
```
通过这些口诀和练习题目,你可以更好地掌握100以内的加减法。