34×0.25{#blank#}1{#/blank#}34

1.24×1{#blank#}2{#/blank#}1.24

1.56×1.5{#blank#}3{#/blank#}1.56

2600×30={#blank#}1{#/blank#}

52×60={#blank#}2{#/blank#}

13×90={#blank#}3{#/blank#}

875{#blank#}3{#/blank#}875÷3.5                 9.36÷1.04{#blank#}4{#/blank#}9.36×1.04

 0.16÷0.08{#blank#}1{#/blank#}0.16×0.08      0.6×0.6{#blank#}2{#/blank#}0.6+0.6

 20.4×0.5 {#blank#}3{#/blank#} 2.04×5           70{#blank#}4{#/blank#}6.9×9.9

6060600{#blank#}1{#/blank#}6060060 210×40{#blank#}2{#/blank#}21×400 4000000{#blank#}3{#/blank#}40万

40000平方米39平方千米   240×30120×60    252÷28216÷7÷4