五（2）有30名学生，在800米跑中有3名学生没有达标，达标率是多少？
===================== 2.5×16======== 1.5÷0.05== 1.5÷0.05==== 2.5×0.4============ 6.25+1.75===============
直接写出得数+=﹣= 0÷6= 39×= 15﹣= 1÷= 21÷=（+）×6=×÷×= 8×﹣=
直接写出得数．========
口算．== 5﹣== 0×1= 1÷===
直接写得数．========
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= 2.5×16=
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= 1.5÷0.05=
= 1.5÷0.05=
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= 2.5×0.4=
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= 6.25+1.75=
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= 0÷6
= 39×
= 15﹣
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= 21÷
=（
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）×6=
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×
﹣
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= 5﹣
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= 1÷
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