直接写得数．+= += 1﹣= ﹣=﹣= += ﹣1= ﹣=3﹣1= +=
口算： 2005﹣1998= 1.6×0.05= 5.7÷0.19= 0.125×0.7=÷=÷6=÷= 40×=÷=×12=×=×201﹣=
2.25×4= 1.01﹣0.91= 1÷0.01=÷=÷5.25=+6.25= 0.74×100= 742+258= 7×÷7×= 10﹣3.2﹣5.8=
直接写出得数．==÷2= 4÷=﹣=÷= 4﹣﹣= 0÷+=×0+9=
×14= 20÷= 1﹣÷=﹣﹣= 2.4÷40%=﹣×0= 1÷﹣÷1= 6×÷6×=
看谁算得快．×=÷=×8=+= 18×2%= 1﹣= 3.5÷18= 137﹣63﹣37= 205﹣199+95= 8.8+1.2= 8π≈ 0.33=
+
+
= 1﹣
= 
﹣
=
﹣
= 
+
= 
﹣1= 
﹣
=
= 
+
=
÷
=
÷
= 40×
=
÷
=
×12=
×
=
×201﹣
÷
=
÷5.25=
+6.25= 0.74×100= 742+258= 7×
÷7×
= 10﹣3.2﹣5.8=
=
=
÷2= 4÷
=
﹣
=
÷
= 4﹣
﹣
= 0÷
+
×0+9=
×14= 20÷
= 1﹣
÷
=
﹣
﹣
= 2.4÷40%=
﹣
﹣
÷6×
×
=
÷
=
×8=
+
=
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