
目錄
— 、加與減(-)········································2
二 、觀察物體········································18
三 、生活中的數(shù)········································22
四 、有趣的圖形········································36
整理與復(fù)習(xí)·····················································44
五、 加與減(二)········································49
數(shù)學(xué)好玩··························································64
六、 加與減(三)········································68
總復(fù)習(xí)···························································· 84