一、口算。
81 - 62 =
2.2 + 9.1 =
630 ÷ 30 =
700 × 13 =
4.3 - 0.25 =
230 + 170 =
7 × 7 =
12 × 4 =
25 × 8 =
0.7 × 7 =
120 × 4 =
2.5 × 8 =
0.07 × 7 =
1.2 × 4 =
0.25 × 8 =
0.007 × 7 =
0.12 × 4 =
0.025 × 8 =
440 ÷ 22 =
0.27 × 2 =
0.35 × 4 =
0.6 × 60 =
3.72 + 1.28 =
1.52 × 2 =

1. 81 - 62 = 19
2. 2.2 + 9.1 = 11.3
3. 630 ÷ 30 = 21
4. 700 × 13 = 9100
5. 4.3 - 0.25 = 4.05
6. 230 + 170 = 400
7. 7 × 7 = 49
8. 12 × 4 = 48
9. 25 × 8 = 200
10. 0.7 × 7 = 4.9
11. 120 × 4 = 480
12. 2.5 × 8 = 20
13. 0.07 × 7 = 0.49
14. 1.2 × 4 = 4.8
15. 0.25 × 8 = 2
16. 0.007 × 7 = 0.049
17. 0.12 × 4 = 0.48
18. 0.025 × 8 = 0.2
19. 440 ÷ 22 = 20
20. 0.27 × 2 = 0.54
21. 0.35 × 4 = 1.4
22. 0.6 × 60 = 36
23. 3.72 + 1.28 = 5
24. 1.52 × 2 = 3.04

二、用竖式计算。
0.92×8=
1.7×54=
1.06×25=
3.76×58=
0.68×25=
0.563×18=

1. 0.92×8=7.36
2. 1.7×54=91.8
3. 1.06×25=26.5
4. 3.76×58=218.08
5. 0.68×25=17
6. 0.563×18=10.134