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近似数

近似数. 青版四年级第七册第一单元信息窗 4 金门路小学. 7 00. 731≈. 9 00. 927≈. 5 000. 5141≈. 9 000. 9478≈. 1 0000. 10576≈. 49 0000. 491478≈. 7 00. 731≈. 9 00. 927≈. 5141≈. 5 000. 9 000. 9478≈. 1 0000. 10576≈. 491478≈. 49 0000. 尾数的最高位是 0 — 4 ,求近似数时 把尾数舍去,全改写成 0 。. 5 00. 475≈. 6 00. 581≈.

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近似数

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  1. 近似数 青版四年级第七册第一单元信息窗4 金门路小学

  2. 700 731≈ 900 927≈

  3. 5000 5141≈ 9000 9478≈

  4. 10000 10576≈ 490000 491478≈

  5. 700 731≈ 900 927≈ 5141≈ 5000 9000 9478≈ 10000 10576≈ 491478≈ 490000

  6. 尾数的最高位是0—4,求近似数时 把尾数舍去,全改写成0。

  7. 500 475≈ 600 581≈ 1945≈ 2000 7000 6541≈ 370000 366054≈

  8. 尾数的最高位是5—9,求近似数时先 向尾数的前一位进1,再把尾数舍去, 全改写成0。 向尾数的前一位进1,

  9. “四舍五入”法: 尾数的最高位是0—4,求近似数时 把尾数舍去,全改写成0。尾数的最高 位是5—9,求近似数时先向尾数的前 一位进1,再把尾数舍去,全改写成0。

  10. 省略万位后面的尾数求近似数 234108≈ 195820≈

  11. 省略万位后面的尾数求近似数 8739200≈ 8733200≈

  12. 省略亿位后面的尾数求近似数 199999999≈ 96895430≈

  13. 填一填: 1、9□567≈10万,“□”里可以 填( )。 5、6、7、8、9 2、9□8320000≈9亿,“□”里最 大可以填( )。 4

  14. 判断: 1、86000000 ≈8600万 × = 2、997000四舍五入到万位约是 100万。 √ 3、近似数为1亿的最大数是9700万。 ×

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