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加、减法的估算

加、减法的估算. 教 师：许 娜. 复习： 1 、写出下列各数的近似数。 196 8006 3507 485 529 113 2999 74. 200. 8000. 3500. 490. 70. 530. 100. 3000. 复习： 2 、写出两个数之间的整千数。 1005 ＞ ( ) ＞ 998 2899 ＜ ( ) ＜ 3060

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加、减法的估算

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  1. 加、减法的估算 教 师：许 娜

  2. 复习：1、写出下列各数的近似数。 196 8006 3507 485 529 113 2999 74 200 8000 3500 490 70 530 100 3000

  3. 复习： 2、写出两个数之间的整千数。 1005 ＞( ) ＞998 2899 ＜( )＜3060 3950＜( )＜4100 7015＞( )＞6997 3000 1000 4000 7000

  4. 180个 340个 第三、四周大约一共收集了多少个？ 192个 219个 500个送一次，大约再收集多少个，就可以送一次了？

  5. ～ ～ ～ ～ ～ ～ ～ ～ 417 1000 600 400

  6. 北京到大连， 飞机票620元， 火车票147元 ～ ～ ～ ～ ～ ～ 乘火车比乘飞机大约便宜（ ）元 500 450 470 620-147 620-147 620-147 600 100 600 150 150

  7. 187元 245元 245＋187 =432（元） 432元 ＞ 400元 答：400元买这两样东西不够。

  8. 通过今天的学习你有什么收获？

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