10＋2={#blank#}1{#/blank#}

17＋2={#blank#}2{#/blank#}

1＋9={#blank#}3{#/blank#}

10－2={#blank#}4{#/blank#}

10－3={#blank#}5{#/blank#}

11＋2={#blank#}6{#/blank#}

15＋2={#blank#}7{#/blank#}

9＋1={#blank#}8{#/blank#}

8＋2={#blank#}9{#/blank#}

7＋3={#blank#}10{#/blank#}

9－2＝                      6＋4＝                    9＋1＝                      1＋1＝                      9－9＝

5＋5＝                    10－1＝                    2＋6＝                      9－7＝                      10－3＝

8－4＝                      6－3＝                      8＋1＝                      5－1＝                      8＋2＝

6＋3＝                      7＋3＝                    10－5＝                    0＋0＝                      3－2＝