70+80{#blank#}1{#/blank#}70+60         5800–800{#blank#}2{#/blank#}6000–3000     130+70{#blank#}3{#/blank#}200+20

700–90{#blank#}4{#/blank#}700–80      1200–200{#blank#}5{#/blank#}1000+200       500–50{#blank#}6{#/blank#}400+50

100+50{#blank#}7{#/blank#}200–60       100–60{#blank#}8{#/blank#}100-70

300+700=    30×10=      98-36=         813-489≈

260-200=     3×32=       500×6=        298-102≈

70+540=     0×980=      7000-2000=    79×5≈

26+70=    800-400=    720+200=    630-80=

74-14=    210+340=    400+500=     730-30=

58+6=    600-100=    960-260=    180+500=