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除 法 估 算

除 法 估 算. ( 1 )口算:. 90÷30=. 3. 160÷40=. 4. 4200÷700=. 6. 12000÷300=. 40. 2000÷400=. 5. 求下面各数的近似数 (省略十位后面的尾数). ( 2 ). 350. ·. ·. 352≈. 479 ≈. 480. (省略百位后面的尾数). ·. ·. 4820 ≈. 4800. 3490 ≈. 3500. 估算:. ( 3 ). 398×12. ≈4000. 400×10. 613×25. ≈18000. 600×30. 16.

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除 法 估 算

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  1. 除 法 估 算

  2. (1)口算: 90÷30= 3 160÷40= 4 4200÷700= 6 12000÷300= 40 2000÷400= 5

  3. 求下面各数的近似数 (省略十位后面的尾数) (2) 350 · · 352≈ 479 ≈ 480 (省略百位后面的尾数) · · 4820 ≈ 4800 3490 ≈ 3500

  4. 估算: (3) 398×12 ≈4000 400×10 613×25 ≈18000 600×30

  5. 16 有538箱酱油,每辆货车一次运62箱。如果一次运完,大约需要多少辆这样的货车? 538≈540 62≈60 540÷60 ≈9(辆) 答:大约需要9辆这样的货车。

  6. 做一做 一列火车每小时行98千米。照这样的速度,从成都到北京的铁路长2048千米,大约要行多少时间? 2048≈2000 98≈100 2048÷98 ≈20(小时) 答:大约要行20小时。

  7. 估算: 639÷31 3574÷42 817÷78 7760÷39 2390÷61 ≈20 ≈21 ≈90 ≈10 ≈200 ≈40

  8. 估算: ≈310 9362÷29 536÷58 6560÷78 7345÷89 2390÷81 ≈300 ≈9 ≈80 ≈80 ≈30

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