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商的变化规律

商的变化规律. 280÷70. =4. 350÷50. =7. 口算. =5. 450÷90. =7. 1400÷200. 4200÷600. =7. 1500÷300. =5. 二、口答填空. 70. 1)70 扩大 ( ) 倍是 4900 。. 25. 2)2500 缩小 100 倍是 ( ) 。. 3)35 扩大 100 倍是 ( ). 3500. 4)3500 缩小 100 倍是 ( ) 。. 35. 填写下表. 6. 6. 6. 6. 被除数和除数同时扩大相同的倍数，商不变。. 被除数和除数同时缩小相同的倍数，商不变。.

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商的变化规律

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  1. 商的变化规律

  2. 280÷70 =4 350÷50 =7 口算 =5 450÷90 =7 1400÷200 4200÷600 =7 1500÷300 =5

  3. 二、口答填空 70 1)70扩大( )倍是4900。 25 2)2500缩小100倍是( )。 3)35扩大100倍是( ). 3500 4)3500缩小100倍是( )。 35

  4. 填写下表 6 6 6 6 被除数和除数同时扩大相同的倍数，商不变。 被除数和除数同时缩小相同的倍数，商不变。

  5. 例10 填写下表 6 6 6 6 在除法里，被除数和除数同时扩大（或缩小）相同的倍数，商不变。

  6. 被除数和除数同时扩大（或缩小）相同的倍数，商不变。被除数和除数同时扩大（或缩小）相同的倍数，商不变。

  7. 下面说法对吗？为什么？ 1. 被除数扩大3倍，除数缩小3倍，商不变。( ) × 2.被除数扩大5倍，除数扩大6倍，商不变。( ) ×

  8. 例11 口算 3600 ÷600 3600÷600 = (3600÷100)÷(600÷100) = 36÷6 = 6

  9. 例11 口算 3600 ÷600 3600÷600 = 36÷6 = 6

  10. 例11 口算 3600 ÷600 3600÷600 = 6 同时缩小100倍：划去被除数、除数末尾各两个0。 同时缩小10倍：划去被除数、除数末尾各一个0。 同时缩小1000倍：划去被除数、除数末尾各三个0。

  11. 例11 口算 4800 ÷400 4800÷400 = 12

  12. 做一做 从上到下，先算出每组题中第1题的商，然后很快地写出下面两题的商。 36÷3 = 12 8 20 72÷9 = 80÷4 = 12 360÷30 = 720÷90 = 8 20 800÷40 = 12 3600÷300 = 7200÷900 = 20 8 8000÷400 =

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