甲数除以乙数商5余4．两个数同时乘上10，这时的商和余数都不变

1.5元{#blank#}1{#/blank#}10元    3.5+1.2{#blank#}2{#/blank#}5   20×30{#blank#}3{#/blank#}15×40

0.5米{#blank#}4{#/blank#}0.7米    7.2-0.8{#blank#}5{#/blank#}0.4    400÷5{#blank#}6{#/blank#}245÷5

19+23=     3.5+4.7=    1.5×3=      3.6÷12=

18× =      + =     1- =        × =       ÷ =

408×3{#blank#}1{#/blank#}1200         402×5{#blank#}2{#/blank#}402×7         209×6{#blank#}3{#/blank#}1000

280×3{#blank#}4{#/blank#}900           400×5{#blank#}5{#/blank#}2000          180×7{#blank#}6{#/blank#}1400