一、口算。
14 - 8 =
11 - 3 =
15 - 8 =
5 + 6 =
11 - 4 =
11 - 2 =
12 - 8 =
7 + 5 =
15 - 6 =
11 - 7 =
13 - 8 =
2 + 9 =
12 - 6 =
12 - 7 =
14 - 7 =
3 + 8 =
14 - 6 =
11 - 5 =
15 - 9 =
4 + 7 =

14 - 8 = 6
11 - 3 = 8
15 - 8 = 7
5 + 6 = 11
11 - 4 = 7
11 - 2 = 9
12 - 8 = 4
7 + 5 = 12
15 - 6 = 9
11 - 7 = 4
13 - 8 = 5
2 + 9 = 11
12 - 6 = 6
12 - 7 = 5
14 - 7 = 7
3 + 8 = 11
14 - 6 = 8
11 - 5 = 6
15 - 9 = 6
4 + 7 = 11

二、填表。


| 加数 | 6 | | 7 | 3 | | | 5 |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| 加数 | 6 | 4 | | | 8 | 7 | |
| 和 | | 13 | 12 | 11 | 14 | 14 | 13 |
| 被减数 | 12 | 15 | | 13 | | 16 | 14 |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| 减数 | | 9 | 7 | 5 | 6 | | 5 |
| 差 | 7 | | 5 | | 9 | 7 | |

6+6=12
13-4=9
12-7=5
11-3=8
14-8=6
14-7=7
13-5=8
12-7=5
15-9=6
7+5=12
13-5=8
6+9=15
16-7=9
14-5=9
| 加数 | 6 | 9 | 7 | 3 | 6 | 7 | 5 |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| 加数 | 6 | 4 | 5 | 8 | 8 | 7 | 8 |
| 和 | 12 | 13 | 12 | 11 | 14 | 14 | 13 |
| 被减数 | 12 | 15 | 12 | 13 | 15 | 16 | 14 |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| 减数 | 5 | 9 | 7 | 5 | 6 | 9 | 5 |
| 差 | 7 | 6 | 5 | 8 | 9 | 7 | 9 |

三、想一想，填一填。

$13 - 4 =□$
$11 - 5 =□$
$12 - 3 =□$

$13-4$：
$\boxed{10}$ $\boxed{3}$
$\boxed{6}$
$\boxed{9}$
$11-5$：
$\boxed{10}$ $\boxed{1}$
$\boxed{5}$
$\boxed{6}$
$12-3$：
$\boxed{10}$ $\boxed{2}$
$\boxed{7}$
$\boxed{9}$