40＜50{#blank#}1{#/blank#}30

50{#blank#}1{#/blank#}20={#blank#}2{#/blank#}

6＋54={#blank#}1{#/blank#}

80－50={#blank#}2{#/blank#}

30＋20＋10＝{#blank#}1{#/blank#}  70－20－30＝{#blank#}2{#/blank#}

90－40－30＝{#blank#}3{#/blank#} 80－30－30＝{#blank#}4{#/blank#}

40＋40＋10＝{#blank#}5{#/blank#} 40＋10＋50＝{#blank#}6{#/blank#}

40+9 =        10 +30 =       59 – 7 =       85 – 80 =

60+40 =       26 +10 =       88 – 8 =       50 +26 =

72 + 27 =      38 – 27 =      54 +25 =       73 – 23 =

100 – 30 =     38 – 35 =      60 + 15 =       16 + 40 =