1. 直接写出得数。(每题 1★)
$0.8 + 1.6 = $ $1.2 - 0.5 = $ $1 - 0.9 = $ $5.5 + 0.5 = $
$8.5 - 5 = $ $0.8 + 1.1 = $ $6.6 - 0.6 = $ $2 - 0.4 = $
$3.3 + 5.4 = $ $2.7 + 6.2 = $ $1.3 + 6 = $ $8.6 - 2.1 = $
$4.9 + 6.2 = $ $8.5 - 6.3 = $ $0.8 + 0.7 = $ $4.5 - 3 = $
$2.1 - 1.7 = $ $3.4 + 5.5 = $ $7.8 - 1.1 = $ $0.4 + 0.9 = $
$10.3 + 8 = $ $7.6 + 2.3 = $ $3.4 - 1.5 = $ $2.3 + 0.6 = $

2.4 0.7 0.1 6
3.5 1.9 6 1.6
8.7 8.9 7.3 6.5
11.1 2.2 1.5 1.5
0.4 8.9 6.7 1.3
18.3 9.9 1.9 2.9
![img alt=2]

2. 列竖式计算。(每题 3★)
$12.3 + 56.9 = $ $100 - 15.7 = $ $15.8 + 49.7 = $



$59.3 - 47.6 = $ $99.3 - 49.8 = $ $21.6 + 2.4 = $

69.2 84.3 65.5
11.7 49.5 24
（竖式略）

3. 脱式计算。(每题 4★)
$46.8 - 21.4 + 57.9$ $100 - (25.6 + 57.8)$ $21.4 + 56.1 - 14.4$

83.3 16.6 63.1