1. 用竖式计算。
405×21= 75×34= 457×16=
405×21= 75×34= 457×16=
答案:
2. 竖式计算,想一想小数乘法得数是多少?
36×27=972 103×14=1442

0.36×2.7= 1.03×0.14=
57×23= 68×202=
竖式: 竖式:
0.57×0.23= 6.8×2.02=
36×27=972 103×14=1442
0.36×2.7= 1.03×0.14=
57×23= 68×202=
竖式: 竖式:
0.57×0.23= 6.8×2.02=
答案:
0.36×2.7 = 0.972 1.03×0.14 = 0.1442

0.57×0.23 = 0.1311 6.8×2.02 = 13.736
0.36×2.7 = 0.972 1.03×0.14 = 0.1442
0.57×0.23 = 0.1311 6.8×2.02 = 13.736
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