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#}．

8×9=         6×6=          4×7=         6×3=

7×6=         9×4=          8+9=          4×8=

9×7=         8×8=          3×5=         2×7=

9×9=         3+5=           1×6=          5×4=

{#blank#}1{#/blank#}七四十二             五 {#blank#}2{#/blank#}四十五             {#blank#}3{#/blank#}六十四

{#blank#}4{#/blank#}九五十四            {#blank#}5{#/blank#}七十二                 {#blank#}6{#/blank#}三十六