300–150 ={#blank#}1{#/blank#}    300+105 ={#blank#}2{#/blank#}    80+120={#blank#}3{#/blank#}

315–200={#blank#}4{#/blank#}     800–600 ={#blank#}5{#/blank#}    205+50 ={#blank#}6{#/blank#}

5×2+24 ={#blank#}7{#/blank#}    16÷4+20 ={#blank#}8{#/blank#}    35 + 15-40 ={#blank#}9{#/blank#}

3079{#blank#}1{#/blank#}3101             5千克{#blank#}2{#/blank#}4998克          400＋600{#blank#}3{#/blank#}1000

280＋480{#blank#}4{#/blank#}540＋270    580－490{#blank#}5{#/blank#}560－470      70＋540{#blank#}6{#/blank#}270＋450

32×2=      300×9=       960-160=       580+80=

+ =      1- =         16÷4=         17×6×0=