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# 数 学 早 读 ( 第三单元复习） - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '数 学 早 读 ( 第三单元复习）' - daryl-rosales

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• 1、两位数乘一位的口算(四大组各做一组题）
• 25×4 = 18×7=
• 25×6= 19×6 =
• 25×8 = 36×2=
• ④ 25×2 = 15×5=

2、几百几十的数乘一位数的口算

150×5= 180×2=

280×3= 120×4=

150×5 =750

1、三位数乘两位数的笔算

228×33 = *18×418 =

417×26 = 283×22 =

2、因数中间或末尾有0的乘法

160×30 = 145×60 =

106×30 = 207×40 =

3、速度、时间和路程的关系

1、两数相乘，一个因数不变，另一个扩大或缩小几倍，积也扩大或缩小几倍。

2、两数相乘，一个因数扩大或缩小几倍，另一个因数缩小扩大相同的倍数，积不变。

1、估算是所得的结果是近似

2、什么时候应估大，什么时

63×27 =1071 （ ）

235×38 =9668 （ ）

70×62 =434 （ ）

810×30 =24300（ ）

108×96 =848 （ ）