例：1个9是(9)，比(10)少(1)．

3个9相加是{#blank#}1{#/blank#}，比{#blank#}2{#/blank#}少{#blank#}3{#/blank#}．

{#blank#}1{#/blank#}

6×{#blank#}1{#/blank#}=30       72÷{#blank#}2{#/blank#}=9        48÷{#blank#}3{#/blank#}=8

9÷{#blank#}4{#/blank#}=9        9×{#blank#}5{#/blank#}=54       36÷{#blank#}6{#/blank#}=9

63÷{#blank#}7{#/blank#}=9       {#blank#}8{#/blank#}×7 =35      {#blank#}9{#/blank#}×4 = 28

4×{#blank#}1{#/blank#}＜25     {#blank#}2{#/blank#}×9＜50     44＞{#blank#}3{#/blank#}×6