①402+7590≈
②69×41≈
③81.35÷9≈
④5789-298≈
()()()()
9×3.14= +÷= 36×= 728﹣299=
72÷0.4= 75×10%= 1÷×= 12.56÷6.28=
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)