2.7×1.02{#blank#}1{#/blank#}2.7           0.9×0.8{#blank#}2{#/blank#}0.9×1.1

12×2.5=           7.5×0.4=        1÷0.625=      8.4÷4.2=

24÷4+56÷4=      2.5+2.5×3=      0.25×8=       12.5÷2.5=

3.21×23＝{#blank#}1{#/blank#}              3.21×2.3＝{#blank#}2{#/blank#}           32.1×2.3＝{#blank#}3{#/blank#}

32.1×0.23＝{#blank#}4{#/blank#}            3.21×0.23＝{#blank#}5{#/blank#}           321×0.023＝{#blank#}6{#/blank#}

0.44×{#blank#}1{#/blank#}=1.672    44×0.038={#blank#}2{#/blank#}。

{#blank#}3{#/blank#}×0.38=0.1672     0.44×380={#blank#}4{#/blank#}。