用10cm的直尺去量，需要量{#blank#}1{#/blank#}次

80={#blank#}2{#/blank#}×10

用小圆片摆一摆、分一分．

4{#blank#}1{#/blank#}6=10         5{#blank#}2{#/blank#}7=35        9{#blank#}3{#/blank#}5=14   

5{#blank#}4{#/blank#}5=25         8{#blank#}5{#/blank#}5=40        5{#blank#}6{#/blank#}3=8

5{#blank#}1{#/blank#}8=40        7{#blank#}2{#/blank#}8=15     16{#blank#}3{#/blank#}8=8     0{#blank#}4{#/blank#}8=8

4×{#blank#}1{#/blank#}<30    {#blank#}2{#/blank#}×6<45

50>8×{#blank#}3{#/blank#}    9×{#blank#}4{#/blank#}<36

四{#blank#}1{#/blank#}二十四                                        {#blank#}2{#/blank#}九五十四                                七八{#blank#}3{#/blank#}。