口算．140÷20= 560÷70= 420÷60= 400÷40=18×3= 25×8= 660÷600= 9000÷90=
直接写出得数．÷= 0×=÷= 1+=×=÷=×=÷=
直接写得数．×8=÷== 6÷=÷= 21×= 1﹣÷=×=
直接写出得数． 1÷100÷10= 1﹣=+1÷3= 6×= 60%÷12=×=÷= 500×3%=
直接写出得数：×8=÷2=÷=×=×= 1÷=÷60%=×15=﹣= 6.8÷10%= 4.5+=×=
直接写出得数．×30= 2÷=÷=﹣=÷=××=+12.5%=÷=
÷
=
÷
= 1+
=
×
=
÷
=
×
=
÷
=
×8=
÷
=
= 6÷
=
÷
= 1﹣
÷
×
=
=
+1÷3= 6×
=
×
= 500×3%=
×8=
÷2=
÷
=
×
=
×
= 1÷
=
÷60%=
×15=
﹣
×
=
×30= 2÷
÷
=
﹣
=
÷
=
×
×
=
+12.5%=
÷
=
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