我是小小口算家．
78+9= 4×6= 2+6= 30﹣8=
14厘米﹣8厘米= 65+23= 6×5= 5×5+7=
20米+7米= 2×3= ×1 ×3=15 3×4﹣5=
74+6﹣80= 81﹣7﹣70= 46+27+18= 85﹣58﹣14=
71﹣65+34=
我是小小口算家．
78+9= 4×6= 2+6= 30﹣8=
14厘米﹣8厘米= 65+23= 6×5= 5×5+7=
20米+7米= 2×3= ×1 ×3=15 3×4﹣5=
74+6﹣80= 81﹣7﹣70= 46+27+18= 85﹣58﹣14=
71﹣65+34=
，则乙班人数比甲班多25%．… ．
米平均分成3份，每份是 米，每份占
米的 ．
=
=
=
=
=
=
=
=
=
=
=
=
= 3÷8=
=
=
=
=
=
=
=
=
÷1
= 21
÷7=
÷7×
= 75÷10%= 0.9+99×0.9=
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