看谁都能口算对．
38+27= 96﹣77= 28+19= 50×8= 69÷3=
71﹣40= 78﹣13= 13×3= 55÷5= 1600﹣800=
36﹣17= 68+17= 7600﹣7000= 90﹣45= 48÷6=
72﹣24=
看谁都能口算对．
38+27= 96﹣77= 28+19= 50×8= 69÷3=
71﹣40= 78﹣13= 13×3= 55÷5= 1600﹣800=
36﹣17= 68+17= 7600﹣7000= 90﹣45= 48÷6=
72﹣24=
= 24÷
=
=
=
=
﹣
=
=
=
﹣1.2=（0.1）3= 3÷1
=
×0.4=
﹣
=
×7=
+1
= 5×
÷5×
+
×
= 21
÷3=
×4= 6﹣
=
÷
=
×
×
=
÷
=
÷
=
÷
=
= 2.5
=
= 1
=
= 1
×
= 3÷1%=
=．
×0=
=
=
=
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