口算，看谁算得又快又准．
72÷8= 28+16= 800÷4= 74﹣47= 2400÷6= 0÷20=
32×20= 60×90= 3000÷6= 45÷5×3= 378÷5≈ 21×22≈
口算，看谁算得又快又准．
72÷8= 28+16= 800÷4= 74﹣47= 2400÷6= 0÷20=
32×20= 60×90= 3000÷6= 45÷5×3= 378÷5≈ 21×22≈
．
÷
= 
+
= 
÷
= 
×
=
÷1= 
÷3= 
﹣
=
÷
= 
×3= 6×
= 
+
×7=
÷1= 
÷7=
= 
÷21= 2.4×
= 42÷
= 
×
=
= 3π= 1﹣
+
= 
×
÷
×
=
÷8= 1÷0.01= 
×6= 
÷
= 1÷
=
+
= 
﹣
= 
÷
= 
+
= 
×
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