花园小学组织四、五年级的学生参加社会实践活动．四年级109人，平均每人掰玉米31个；五年级110人，平均每人掰玉米38个．估算一下，四、五年级的学生大约各掰玉米多少个？
口算我最棒!÷3=﹣= 8÷=×8= 30×50%= 0.25×29×4= 6÷120%= 1﹣97%=
+= 8÷=×= 3÷= 4×==÷===
直接写出得数．﹣=×=÷6= 1﹣10%=÷=÷= 1÷20%=+=×= 20×90%=
直接写出得数．÷=÷3= 12×= 2﹣=+=×= 2÷=+= 20÷=×=
+=×=+120=×120=×= 40﹣2=×=+﹣=
÷3=
﹣
= 8÷
×8= 30×50%=
+
= 8÷
=
×
=
= 4×
=
=
÷
=
=
=
﹣
=
×
=
÷6= 1﹣10%=
÷
=
÷
= 1÷20%=
+
=
×
= 20×90%=
÷
=
= 2﹣
=
+
=
×
= 2÷
=
+
=
=
×
=
+
=
+120=
×
= 40﹣2
=
×
=
+
﹣
=
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