口算．6×3= 46﹣8= 30÷6= 17+8=500+700= 170﹣90= 48÷6= 75﹣36=18÷9×2= 8×4+30= 81÷9+20= 60﹣6×9=
24×= 15÷=×=÷= 1÷25%=+= 3×÷3×50%=（1﹣1%）÷99%=
直接写得数×8× 81÷÷ 63÷×× 3×÷3× 36×25%
直接写得数．==== 8×3.14== 1÷75%==
0×=4= 21×==×3×8= 1=﹣== 2.5×=（）×20=
直接写得数． 6×= 10÷= 1÷=÷6=×=÷×0= 1﹣﹣=÷×=
= 15÷
=
×
=
÷
=
+
÷3×50%=（1﹣1%）÷99%=
×8
×
81÷
÷
×
×
3×
÷3×
=
=
=
=
= 1÷75%=
=
=
4= 21×
=
=
×3×8=
=
﹣
=
= 2.5×
=（
）×20=
= 10÷
= 1÷
=
÷6=
×
=
÷
×0= 1﹣
﹣
=
÷
×
=
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