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一、口算。
$402×6=$
$72×40=$
$106×2=$
$33×50=$
$90×60=$
$70×14=$
$600×90=$
$70×33=$
$250×8=$
$240×20=$
$30×400=$
$73×30=$
$37×50=$
$130×30=$
$60×29=$
$310×30=$
$80×45=$
$80×56=$
$21×6=$
$120×40=$
$330×30=$
$85×30=$
$370×9=$
$380×3=$
$402×6=$
$72×40=$
$106×2=$
$33×50=$
$90×60=$
$70×14=$
$600×90=$
$70×33=$
$250×8=$
$240×20=$
$30×400=$
$73×30=$
$37×50=$
$130×30=$
$60×29=$
$310×30=$
$80×45=$
$80×56=$
$21×6=$
$120×40=$
$330×30=$
$85×30=$
$370×9=$
$380×3=$
答案
1.2412
2.2880
3.212
4.1650
5.5400
6.980
7.54000
8.2310
9.2000
10.4800
11.12000
12.2190
13.1850
14.3900
15.1740
16.9300
17.3600
18.4480
19.126
20.4800
21.9900
22.2550
23.3330
24.1140
2.2880
3.212
4.1650
5.5400
6.980
7.54000
8.2310
9.2000
10.4800
11.12000
12.2190
13.1850
14.3900
15.1740
16.9300
17.3600
18.4480
19.126
20.4800
21.9900
22.2550
23.3330
24.1140
二、用竖式计算。
$283×27=$
$502×12=$ 
$280×45=$ 
$205×24=$ $385×36=$ $370×38=$
$283×27=$
$502×12=$ $280×45=$ $205×24=$ $385×36=$ $370×38=$
答案
1.7641
2.6024
3.12600
4.4920
5.13860
6.14060
2.6024
3.12600
4.4920
5.13860
6.14060
