－0.25＝{#blank#}2{#/blank#}

×0.25＝{#blank#}3{#/blank#}

÷0.25＝{#blank#}4{#/blank#}

0.89×0.12○0.89        4.05×1.01○4.05×0.99     6.7×0.98○6.7

6.09×1.3○6.09        5.15×3.3○51.5×0.33      18×0.35○0.35

6.3×2.04○2.04         4.8×7.5○7.5×4.8         3.9×1○1

2.45×0.3{#blank#}1{#/blank#}     6.32×0.51{#blank#}2{#/blank#}     0.37×0.15{#blank#}3{#/blank#}

0.58÷0.99{#blank#}1{#/blank#}0.58           2÷4.5{#blank#}2{#/blank#}2÷5.4

9.2×0.1{#blank#}3{#/blank#}9.2÷10          47×0.99{#blank#}4{#/blank#}47×1.02

0.38×0.25=               0.87×1.9=(得数保留两位小数)

150×0.12=               8.5×0.39=(验算)