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1. 涂一涂，算一算。
$0.02×8=$
$0.4×0.5=$
$0.02×8=$
$0.4×0.5=$
答案
2. 根据每组第一个算式，在括号里填上合适的数。
$3.5×6.3 = 22.05$
$19×0.017 = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
$3.5×6.3 = 22.05$
$19×0.017 = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
$(\ \ \ \ )×(\ \ \ \ ) = 22.05$
$(\ \ \ \ )×(\ \ \ \ ) = 0.323$
答案
3. 用竖式计算。
$1.8×6.45 =$
$0.39×2.6 =$
$70.4×4.3 =$
$1.8×6.45 =$
$0.39×2.6 =$
$70.4×4.3 =$
答案
4. 递等式计算。(能简便的用简便方法计算)
$3.67 + 1.2×9.5$
$7.8×31.5 + 22×3.15$
$3.67 + 1.2×9.5$
$7.8×31.5 + 22×3.15$
答案
5. 如果每千克葵花子可以榨油0.22千克，那么收的葵花子大约可以榨油多少千克？
答案
