口算0×6 20+80÷4 0÷60×3 40÷20+16 390÷3100﹣20×3 1+2+3+0 70×80 800÷4﹣100 90×8．
直接写出得数．×8= 10×= 21×= ÷= （﹣）×28=10÷10%= 0÷= += ÷= 3.14×8=
直接写出得数．= = == = == = =
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%=
×8= 10×
= 21×
= 
÷
= （
﹣
）×28=
= 
+
= 
÷
= 3.14×8=
= 
= 
=
= 
= 
=
= 
= 
=
÷
= 
÷
= 1+
=
×
= 
÷
= 
×
= 
÷
=
×8= 
÷
= 
= 6÷
=
÷
= 1﹣
÷
×
=
= 
+1÷3= 6×
=
×
= 500×3%=
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