一、口算。
8.9 - 1.2 =
1.3 + 3.2 =
5.5 + 4.1 =
6.3 + 3.3 =
9.3 - 2.1 =
6.4 - 2.3 =
9.9 - 9.6 =
5.4 + 2.5 =
6.2 + 1.7 =
7.7 + 2.1 =
2.4 - 2.1 =
8.6 - 1.5 =
9.3 - 7.1 =
7.6 + 1.3 =
3.3 + 2.4 =
2.1 + 4.8 =
4.7 - 3.6 =
5.3 - 5.1 =
7.9 - 1.5 =
6.4 + 5.4 =
1.7 + 7.2 =
4.5 + 8.2 =
5.5 - 2.4 =
8.9 - 8.8 =
8.8 - 4.2 =
4.5 + 3.3 =
5.6 + 0.3 =
3.6 + 5.2 =
7.5 - 2.1 =
9.6 - 3.2 =

7.7 4.5 9.6
9.6 7.2 4.1
0.3 7.9 7.9
9.8 0.3 7.1
2.2 8.9 5.7
6.9 1.1 0.2
6.4 11.8 8.9
12.7 3.1 0.1
4.6 7.8 5.9
8.8 5.4 6.4

二、用竖式计算。
43.7 + 18.9
30.1 - 19.2
19.4 - 9.8

62.6 10.9 9.6