3只 {#blank#}2{#/blank#}个点，4只 {#blank#}3{#/blank#}个点，

5只 {#blank#}4{#/blank#}个点，6只 {#blank#}5{#/blank#}个点，

7只 {#blank#}6{#/blank#}个点，8只 {#blank#}7{#/blank#}个点。

4×6＝                                5×6＝                                     6×6＝

6×7                                  6×8＝                                     6×9＝

三{#blank#}1{#/blank#}二十一         {#blank#}2{#/blank#}八四十            二{#blank#}3{#/blank#}得八

六八{#blank#}4{#/blank#}              五六{#blank#}5{#/blank#}             {#blank#}6{#/blank#}八十六

5×6=      5×5=      8×8=      6×8=

8×5=      3×4=      4×9=      9×3=

7×7=      2×8=      9×2=      6×9-7=

6+60=     23-4=     9×9+3=    8×7-6=