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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 617 · 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 1409 ÷ 19? (a) 140 (b) 700 (c) 35 (d) 70
  2. 2.Round 45835 to the nearest thousand.
  3. 3.Which is closest to 402 + 495 + 795? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  4. 4.Which is closest to 899 × 40? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  5. 5.Which is closest to 202 × 92? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  6. 6.Which is closest to 2003 ÷ 49? (a) 80 (b) 40 (c) 400 (d) 20
  7. 7.Which is closest to 703 + 600 + 197? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  8. 8.Which is closest to 399 × 42? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  9. 9.Round 32.69 to one decimal place. =
  10. 10.Which is closest to 196 + 196 + 297? (a) 600 (b) 800 (c) 900 (d) 700
  11. 11.Round 74.44 to one decimal place. =
  12. 12.Round 25.16 to one decimal place. =
  13. 13.Which is closest to 201 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  14. 14.Which is closest to 299 × 52? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  15. 15.Which is closest to 404 + 296 + 100? (a) 700 (b) 1000 (c) 900 (d) 800
  16. 16.Round 94.18 to one decimal place. =
  17. 17.Which is closest to 497 × 51? (Round each number first.) (a) 25000 (b) 2500 (c) 250000 (d) 50000
  18. 18.Which is closest to 601 + 805 + 495? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  19. 19.Which is closest to 2103 ÷ 31? (a) 70 (b) 700 (c) 35 (d) 140
  20. 20.Round 15010 to the nearest hundred.
  21. 21.Which is closest to 603 + 305 + 795? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  22. 22.Which is closest to 4005 ÷ 51? (a) 800 (b) 160 (c) 40 (d) 80
  23. 23.Round 13.73 to one decimal place. =
  24. 24.Which is closest to 2509 ÷ 51? (a) 25 (b) 50 (c) 100 (d) 500
  25. 25.Which is closest to 896 × 60? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  26. 26.Round 29605 to the nearest hundred.
  27. 27.Which is closest to 803 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
  28. 28.Round 90.88 to one decimal place. =
  29. 29.Which is closest to 1496 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  30. 30.Round 40364 to the nearest ten.
  31. 31.Which is closest to 1603 ÷ 19? (a) 160 (b) 40 (c) 800 (d) 80
  32. 32.Round 94192 to the nearest ten.
  33. 33.Which is closest to 98 + 305 + 105? (a) 600 (b) 700 (c) 500 (d) 400
  34. 34.Round 30.81 to one decimal place. =
  35. 35.Round 3602 to the nearest hundred.
  36. 36.Which is closest to 802 × 22? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  37. 37.Which is closest to 4492 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  38. 38.Round 96.64 to one decimal place. =
  39. 39.Round 12487 to the nearest ten.
  40. 40.Round 86.59 to one decimal place. =

Answer key

  1. 70
  2. 46000
  3. 1700
  4. 36000
  5. 18000
  6. 40
  7. 1500
  8. 16000
  9. 32.7
  10. 700
  11. 74.4
  12. 25.2
  13. 18000
  14. 15000
  15. 800
  16. 94.2
  17. 25000
  18. 1900
  19. 70
  20. 15000
  21. 1700
  22. 80
  23. 13.7
  24. 50
  25. 54000
  26. 29600
  27. 40
  28. 90.9
  29. 30
  30. 40360
  31. 80
  32. 94190
  33. 500
  34. 30.8
  35. 3600
  36. 16000
  37. 90
  38. 96.6
  39. 12490
  40. 86.6

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