直接写得数．﹣= ÷= ×= ×= 10×= ×=÷= ÷= 15×= ÷= += ÷22=
计算并验算 749+163= 940﹣490= 808﹣108=
用9、1、3造一个减法塔．
85﹣58= 58+37= 92﹣44﹣26= 56﹣27+19= 37+63= 39+51= 66﹣48= 44+33﹣55=
用竖式计算．
写算式
﹣
= 
÷
= 
×
= 
×
= 10×
= 
×
=
÷
= 
÷
= 15×
= 
÷
= 
+
= 
÷22=
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