口算小博士．×= ÷2= 80%﹣20%= 4×25%+16×25%=×= ×72%= ×÷= ×÷×=
直接写得数．×= 1÷= 4×60%= 0.875÷0.125= 0.25××4=÷2= 10÷= ×3.6= （）2= ÷×0=
口算：×= 45×= ÷10= 0÷8=5.4×= ÷= 0.65×= 50%﹣0.05=
直接写出得数 1÷= 1﹣= ÷= 48×12.5%=+= ×= ÷10= 5÷﹣÷5=
直接写得数．= = == = =
×
= 
÷2= 80%﹣20%= 4×25%+16×25%=
= 
×72%= 
×
÷
= 
×
÷
×
= 1÷
= 4×60%= 0.875÷0.125= 0.25×
×4=
÷2= 10÷
= 
×3.6= （
）2= 
÷
×0=
×
= 45×
= 
÷10= 0÷8
=
= 
÷
= 0.65×
= 50%﹣0.05=
= 1﹣
= 
= 48×12.5%=
+
= 
×
= 
÷10= 5÷
﹣
= 
= 
=
= 
= 
=
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