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分数的基本性质

分数的基本性质. 武进区郑陆中心小学 周 刚. 用分数表示每个图里的涂色部分。. ( ). ( ). ( ). ( ). 把一张长方形纸对折, 涂色表示它的. 继续对折,你能找到与它相等的分数吗?. =. =. =. =. =. =. 从左往右看,每一组中,你能发现它们的分子、分母是怎样变化的吗?从右往左看呢?先试着填写,填完后在小组里说说你的发现。. =. =. =. 1× 2 2× 2. 2 ÷ 2 4 ÷ 2. =. =. 1× 4 2× 4. 4 ÷ 4 8 ÷ 4. =. =.

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分数的基本性质

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  1. 分数的基本性质 武进区郑陆中心小学 周 刚

  2. 用分数表示每个图里的涂色部分。 ( ) ( ) ( ) ( )

  3. 把一张长方形纸对折, 涂色表示它的 继续对折,你能找到与它相等的分数吗?

  4. = = = = = 从左往右看,每一组中,你能发现它们的分子、分母是怎样变化的吗?从右往左看呢?先试着填写,填完后在小组里说说你的发现。 = = = 1× 2 2× 2 2 ÷2 4 ÷ 2 = = 1× 4 2× 4 4 ÷ 4 8 ÷4 = = 1×8 2× 8 8 ÷8 16 ÷ 8 = =

  5. 练一练 1.先涂一涂,再填一填。 ( ) = = ( )

  6. 练一练 1.先涂一涂,再填一填。 ( 3 ) = = ( 6 )

  7. 2. 判断下列等式是否成立,并说明理由。 5× 3 6 × 3 = = ( ) √ 6 ÷ 2 24÷ 2 = = ( ) √ 2× 2 16÷ 2 ( ) × = = 2× 2 3× 3 ( ) × = = 3 + 6 5 + 6 ( ) × = = 3 + 3 4 + 4 ( ) √ = =

  8. = ( ) ( ) = ( ) = ( ) ÷3=( )÷9 = 3.填一填: 2 3 ( ) = 25 你能根据分数的基本性质,写出一组相等的分数吗? 6 6 2

  9. 4.在下面的方格纸上涂色表示 。 涂色部分还表示几分之几?

  10. 拓展应用: = (a、b都是不为0的自然数) 当a是1、2、3、4……时,b分别是多少? a和b有怎样的关系?

  11. 谢谢! 2009年4月1日

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