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1. 口算。
$0.58 + 0.6 = $
$9.4 - 1.4 = $
$0.58 + 0.6 = $
1.18
$6.7 - 5.8 = $0.9
$5.4 + 1.6 = $7
$6 - 2.5 = $3.5
$9.4 - 1.4 = $
8
$5.4 + 4.6 = $10
$6.6 - 5.1 = $1.5
$3.7 + 7.3 = $11
答案：
1.18 0.9 7 3.5 8 10 1.5 11
$\triangle 13.6 + 8.46 = $
22.06
$12.21 - 5.59 = $6.62
$\triangle 10 - 7.63 = $2.37
答案：
22.06 6.62 2.37 竖式及验算略
3. 用小数计算下面各题。
$11km50m + 630m$ $5kg80g + 4kg15g$
$11km50m + 630m$ $5kg80g + 4kg15g$
答案：
$ 11.05km + 0.63km = 11.68km $
$ 5.08kg + 4.015kg = 9.095kg $
$ 5.08kg + 4.015kg = 9.095kg $
4. 计算下面各题,能简算的要简算。
$7.5 - 2.45 + 7.5 + 2.45$ $0.9 + 0.99 + 0.999$ $13.26 - 5.7 + 4.3$
$0.66 + 7.85 + 0.15$ $4.6 - 13.46 + 15.4 - 2.54$ $9.36 - (4.36 - 3.3)$
$7.5 - 2.45 + 7.5 + 2.45$ $0.9 + 0.99 + 0.999$ $13.26 - 5.7 + 4.3$
$0.66 + 7.85 + 0.15$ $4.6 - 13.46 + 15.4 - 2.54$ $9.36 - (4.36 - 3.3)$
答案：
15 2.889 11.86 8.66 4 8.3
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