① 直接写出得数。(每题1分,共20分)
$3.44+4.7=$
$9.14-1.43-4.57=$
$6.7-2.9=$
$0.38+0.36+2.64=$
$7.4-2.5=$
$51.27-8.03-1.34=$
$4.2+11.7=$
$3.7+2.9-1.9=$
$10+4.7=$
$5.6-3.4+9.1=$
$7.9-2.4=$
$15.7+17.9-3.4=$
$19.7-4.9=$
$7.7-4.9+9.6=$
$103.7+9.6=$
$47.3+27.7-40=$
$59.7+3.6=$
$11.1+6.6-4.7=$
$96.6-23.4=$
$9.73+2.4-6.9=$

1. 8.14
2. 3.14
3. 3.8
4. 3.38
5. 4.9
6. 41.9
7. 15.9
8. 4.7
9. 14.7
10. 11.3
11. 5.5
12. 30.2
13. 14.8
14. 12.4
15. 113.3
16. 35
17. 63.3
18. 13
19. 73.2
20. 5.23

② 列竖式计算。(每题3分,共12分)
16.34+7.96=
40-5.84=
13.74+8.9=
7.45-2.57=

竖式略
1. 24.3
2. 34.16
3. 22.64
4. 4.88

③ 计算下面各题,能简算的要简算。(每题3分,共18分)
$89.3-5.6-4.4$
$18.75-(6.5+8.75+3.5)$
$2.37-(2.4-1.63)$
$28-7.3-2.7$
$0.9+0.99+0.999+0.9999$
$10.87+9.56+9.13+17.44$

1. 79.3
2. 0
3. 1.6
4. 18
5. 3.8889
6. 47