5×8=         4×5=           54＋9=        8×9=

6×3=        6＋80=          6×7=       64－30=

三{#blank#}1{#/blank#}十五            四{#blank#}2{#/blank#}十六        三{#blank#}3{#/blank#}十八

五{#blank#}4{#/blank#}三十           {#blank#}5{#/blank#}六得六        {#blank#}6{#/blank#}三得九

四{#blank#}1{#/blank#}二十四                                        {#blank#}2{#/blank#}九五十四                                七八{#blank#}3{#/blank#}。

8×2◯4×4       64-8◯7×8

8×5◯5×8       6×8◯7×7