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分数的基本性质

分数的基本性质. 田志刚. 4. 12. 9. 27. 根据分数与除法的关系,以及整数除法中商的 变化规律,也能说明分数的基本性质。. =4÷9. = ( 4×3 ) ÷ ( 9×3 ). =12÷27. =. 判断. ×. ( 1 )分数的分子和分母同时加或减相同的数,分数的大小不变。 ( ).

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分数的基本性质

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  1. 分数的基本性质 田志刚

  2. 4 12 9 27 根据分数与除法的关系,以及整数除法中商的 变化规律,也能说明分数的基本性质。 =4÷9 =(4×3)÷(9×3) =12÷27 =

  3. 判断 × (1)分数的分子和分母同时加或减相同的数,分数的大小不变。 ( ) (2)分数的分子和分母同时乘或除以相同的数,分数的大小不变。 ( ) × (3)分数的分子和分母同时乘或者除以一个数(0除外),分数的大小不变。 ( ) × (4)分数的分子和分母同时乘或者除以相同的数(0除外),分数的大小不变。 ( ) √

  4. 12 12 10 24 10 24 2× 3×4 = = = 10 24 ÷ ÷ = 2 3 2 3 把 和 化成分母是 12 而大小不变的分数。 2 4 8 5 2

  5. 10 15 ( ) 6 ( ) 3 ( ) 8 ( ) 18 ( ) 3 ( ) 30 = = = 2 ( ) 15 ( ) 5 ( ) 14 ( ) 9 ( ) 8 24 7 10 3 4 1 4 5 9 1 3 1、在下面的括号里填上适当的数。 = = 6 = = 21 12 20 = = 10 = = 1 27 6 2 2 20

  6. 16 20 6 10 8 10 16 20 3×2 5×2 = = 2. 把 和 化成分母是 10 而大小不变的分数。 16÷2 20÷2 = = 3 5 3 5

  7. 12 14 16 8 10 18 5 30 1 6 5 9 4 2 6 7 3、连线

  8. 3 8 5 8 9 24 20 32 9 24 20 32 9 24 20 32 4、思考题:比较下面两个分数的大小。 和 = = ﹤

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