5.3÷0.99{#blank#}1{#/blank#}5.3    2.4÷100{#blank#}2{#/blank#}2.4×0.01

4.9×0.67{#blank#}3{#/blank#}4.9    0.8+0.8{#blank#}4{#/blank#}0.8×0.8

10.35÷0.5{#blank#}1{#/blank#}10.35             0.45÷0.65{#blank#}2{#/blank#}1 

10.35÷1.2{#blank#}3{#/blank#}10.35÷0.6÷2      9.6÷1.2{#blank#}4{#/blank#}9.6

0.5÷0.6{#blank#}1{#/blank#}0.5

0.55×0.9{#blank#}2{#/blank#}0.55

36÷0.01{#blank#}3{#/blank#}3.6×100

7.3÷0.3{#blank#}4{#/blank#}73÷3．

81÷27={#blank#}1{#/blank#}

8100÷2700={#blank#}2{#/blank#}

270÷90={#blank#}3{#/blank#}

810÷30={#blank#}4{#/blank#}