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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 810 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 498 × 30? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  2. 2.Which is closest to 596 × 90? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  3. 3.Which is closest to 901 + 505 + 295? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  4. 4.Round 90442 to the nearest thousand.
  5. 5.Round 29956 to the nearest thousand.
  6. 6.Round 2825 to the nearest thousand.
  7. 7.Which is closest to 2993 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  8. 8.Round 55.11 to one decimal place. =
  9. 9.Which is closest to 696 + 500 + 805? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  10. 10.Which is closest to 502 × 19? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  11. 11.Round 70912 to the nearest thousand.
  12. 12.Which is closest to 602 × 80? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  13. 13.Which is closest to 595 + 800 + 795? (a) 2100 (b) 2300 (c) 2200 (d) 2400
  14. 14.Which is closest to 499 × 79? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  15. 15.Which is closest to 599 × 81? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  16. 16.Which is closest to 904 ÷ 29? (a) 60 (b) 30 (c) 300 (d) 15
  17. 17.Which is closest to 2703 ÷ 31? (a) 90 (b) 180 (c) 45 (d) 900
  18. 18.Round 53.21 to one decimal place. =
  19. 19.Which is closest to 603 + 804 + 805? (a) 2200 (b) 2400 (c) 2100 (d) 2300
  20. 20.Which is closest to 403 × 58? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  21. 21.Round 67166 to the nearest thousand.
  22. 22.Which is closest to 304 + 500 + 702? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  23. 23.Which is closest to 598 × 62? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  24. 24.Which is closest to 200 × 62? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  25. 25.Which is closest to 596 + 595 + 604? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  26. 26.Round 73332 to the nearest ten.
  27. 27.Which is closest to 3195 ÷ 41? (a) 80 (b) 40 (c) 800 (d) 160
  28. 28.Round 40882 to the nearest thousand.
  29. 29.Which is closest to 2002 ÷ 51? (a) 40 (b) 20 (c) 80 (d) 400
  30. 30.Round 59.68 to one decimal place. =
  31. 31.Which is closest to 1600 ÷ 21? (a) 800 (b) 40 (c) 160 (d) 80
  32. 32.Which is closest to 304 × 30? (Round each number first.) (a) 90000 (b) 9000 (c) 900 (d) 18000
  33. 33.Which is closest to 603 × 29? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  34. 34.Round 31.81 to one decimal place. =
  35. 35.Which is closest to 201 + 97 + 100? (a) 400 (b) 600 (c) 500 (d) 300
  36. 36.Which is closest to 3495 ÷ 49? (a) 35 (b) 140 (c) 700 (d) 70
  37. 37.Which is closest to 600 × 49? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  38. 38.Which is closest to 1202 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  39. 39.Which is closest to 1807 ÷ 19? (a) 45 (b) 900 (c) 180 (d) 90
  40. 40.Round 70414 to the nearest ten.

Answer key

  1. 15000
  2. 54000
  3. 1700
  4. 90000
  5. 30000
  6. 3000
  7. 60
  8. 55.1
  9. 2000
  10. 10000
  11. 71000
  12. 48000
  13. 2200
  14. 40000
  15. 48000
  16. 30
  17. 90
  18. 53.2
  19. 2200
  20. 24000
  21. 67000
  22. 1500
  23. 36000
  24. 12000
  25. 1800
  26. 73330
  27. 80
  28. 41000
  29. 40
  30. 59.7
  31. 80
  32. 9000
  33. 18000
  34. 31.8
  35. 400
  36. 70
  37. 30000
  38. 60
  39. 90
  40. 70410

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