20以内减法练习题(破十法)
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2021年01月20日 18:15
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.
20
以内减法练习题（破十法）
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。）
例
：
15
—
8 =
7
5
10
2
18
—
9 = 17
15
—
9 = 14
12
—
9 = 11
16
—
8 = 15
13
—
8 = 12
16
—
7 = 15
—
9 = 16
—
9 =
—
9 = 17
—
8 = 14
—
8 =
—
7 = 14
1
/
14'.
—
9 =
13
—
9 =
—
8 =
—
8 =
11
—
8 =
—
7 =
.
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 = 11
—
3 = 11
—
5 = 11
2
/
14'.
13
—
6 =
—
5 =
—
5 =
—
4 =
—
2 =
—
5 =
.
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
3
/
14'.
—
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
/
14'.
—
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
/
14'.
—
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
/
14'.
—
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 =
—
9 = 17
—
8 = 14
7
/
14'.
—
9 =
—
9 =
11
—
7 =
—
8 =
—
8 =