口算小博士．30÷3= 810÷9= 300÷5=640÷8= 360÷6= 140÷2=
直接写出得数． 2.4﹣= 16×20=÷6= （2﹣）×20%= 2.2+3.57=+=×= 14﹣14÷2=
2﹣1.02= 1+3.25= 4÷= 2.5×=﹣= 10﹣1=﹣×= 0.37÷ = （1﹣100%）×3=
直接写出得数． 32+68= 910﹣440= 18×10= 910÷70= 12﹣= 10×10%= 2÷= 4.5×102= 8.1÷0.03=÷=
56+37=80﹣16=31.5+5=12﹣1.1= 2×0.2=2.87÷0.7=30÷50=25×8=========
口算，直接写出得数． 64﹣46= 1.72+2.38= 0.25×40= 2.4÷0.6=== 12= 8×12.5%== 0.52=
=
÷6=
）×20%=
=
×
=
+3.25= 4÷
= 2.5×
=
﹣
= 10﹣1
=
﹣
= 10×10%= 2÷
= 4.5×102=
÷
=
=
=
=
=
=
=
=
=
=
= 12
= 8×12.5%=
= 0.52=
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