每千克苹果1.22元，买12.3千克应付多少元？

4.8×0.35                        3.12×0.9

12÷{#blank#}1{#/blank#}12       ÷ {#blank#}2{#/blank#}         × {#blank#}3{#/blank#} ×

8× {#blank#}4{#/blank#}       × {#blank#}5{#/blank#}        12÷ {#blank#}6{#/blank#}12×

20×30                           0.2×0.3                            

=(2×10)×(3×10)      =(2×0.1)×(3×0.1)

=(2×3)×(10×10)     =(2×3)×(0.1×0.1)

=6×100                 =6×0.01

=600                     =0.06