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 = $

8.14 3.14 3.8 3.38
4.9 41.9 15.9 4.7
14.7 11.3 5.5 30.2
14.8 12.4 113.3 35
63.3 13 73.2 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
24.3 34.16 22.64 4.88

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

79.3 0 1.6
18 3.8889 47