120米={#blank#}2{#/blank#}千米

650克={#blank#}1{#/blank#}千克                  90厘米＝{#blank#}2{#/blank#}米

456千克＝{#blank#}3{#/blank#}吨               8米90厘米={#blank#}4{#/blank#}米

2千克600克＝{#blank#}5{#/blank#}千克          7元4角8分={#blank#}6{#/blank#}元

504×5{#blank#}1{#/blank#}2520      420×3{#blank#}2{#/blank#}1260 

560×5{#blank#}3{#/blank#}2700      1256{#blank#}4{#/blank#}304×4

46÷2=     107×5=         33×9×0=        560÷8=       1002-516=

35×4=          89-3×7=        75÷5=          140×4=