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五上数学‖小数简便运算‖期末复习题

一、归类练习:

(先拆数，乘法分配律)

35×10.2

=35×(10+0.2)

=35×10+35×0.2

=350+7

=357

(先拆数,乘法结合律)

0.25×0.28

=0.25×4×0.07

=(0.25×4)×0.07

=1×0.07

=0.07

(先拆数，乘法结合律)

0.125×8.8

=0.125×8×1.1

=(0.125×8)×1.1

=1×1.1

=1.1

(乘法结合律)

3.29×0.25×4

=3.29×(0.25×4)

=3.29×1

=3.29

(减法交换)

7.325-3.29-3.325

=7.325-3.325-3.