
一、 大數(shù)的認(rèn)識······················1
1億張紙條摞起來有多高········19
二、 乘法··········································20
三、 運(yùn)算定律································27
整理與復(fù)習(xí)
四、 線與角········································37
五、 方向與位置······························46
魔術(shù)紙圈································54
六、 除法··········································56
七、 用計(jì)算器探索規(guī)律····················82
八、 條形統(tǒng)計(jì)圖·······························85
九、 可能性········································91
十、 數(shù)學(xué)百花園·······························93
1.重疊問題
2.方陣問題
3.編碼
十一、 總復(fù)習(xí)································96
附錄、··············································105