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简介:
五年级上册数学‖小数乘法简便计算
小数乘法简便计算(1)
1.25×4.37×0.8
=1.25×0.8×4.37
=1×4.37
=4.37 6.4×1.33+3.6×1.33
=1.33×(6.4+3.6)
=1.33×10
=13.3
7.83×10.3-7.83×0.3
=7.83×(10.3-0.3)
=7.83×10
=78.3 10.5×8.5+10.5×1.5
=10.5×(8.5+1.5)
=10.5×10
=105
6.74×99+6.74
=6.74×(99+1)
=6.74×100
=674 0.038×4×0.25
=0.038×(4×0.25)
=0.038×1
=0.038
5.8×10.1
=5.8×(10+0.1)
=5.8×10+5.8×0.1
=58+0.58
=58.58 102×0.36
=(100+2)×0.36
=100×0.36+2×0.36
=36+0.72
=36.72
12.5×0.15×8
=12.5×8×0.15
=100×0.15
=15 0.25×(4+0.4)
=0.25×4+0.25×0.4
=1+0.1
=1.1