九月是学校环保月，四年二班学生42人共收集了840个矿泉水瓶，全班平均每天收集多少个？每个矿泉水瓶卖5分钱，这个月班里平均每个学生能为班级积攒多少元班费？
12.5×8= 3.4== 0.125×7×8= 1===（=
看谁算得快． 0.36+1.7=×= 0.32×0.05= 1.2÷=×÷×= 6.8﹣1.08= 50×30%=﹣﹣= 0.18÷0.12=（+）×8=
直接写出得数． 25×24= 4.2÷0.2== 12﹣2== 1.25×= 1÷0.6= 4÷2=
73÷9．
直接写出得数． 4.8×50%= 3÷30%﹣4= 88÷11%=×40%= 9.8×20%+0.2×20%=÷=×8+8×=÷3×÷3=
=
= 0.125×7×8=
=
=
=（
=
×
= 0.32×0.05= 1.2÷
=
×
÷
×
= 6.8﹣1.08= 50×30%=
﹣
﹣
=
+
= 12﹣2
=
= 1.25×
= 1÷0.6= 4
÷2=
÷9．
×40%=
÷
=
×8+8×
=
÷3×
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