算一算．20×40= 40×10= 60×70= 28×50= 15×20=2500÷5= 540÷9= 4900÷7= 3000÷6= 5000÷5=
直接写出得数． 14×=×5=×= 12×= 3×= 7×= 4.8+0.82= 3﹣2.7=（+2）×9=（﹣）×2=
口算题．×=×=×9=××0=+=×11= 5﹣﹣=×9×7=
口算×15=×2=×=×=×= 1×=×=×34=×=×=×=×=×=×=×=×24=×=×30= 28×=×=
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
计算． 1×4.8 2×3.5 2.3×1 2×0.63．
=
×5=
×
= 12×
= 3×
=
= 4.8+0.82= 3
﹣2.7=（
+2）×9=（
﹣
）×2=
×
=
×
=
×9=
×
×0=
+
=
×11= 5﹣
﹣
=
×9×7=
×15=
×2=
×
=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
×
=
×
=
×
=
×24=
×
=
×30= 28×
=
×
=
×15=
×2=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
×
=
×4.8 2
×3.5 2.3×1
2
×0.63．
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