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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 686 · 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 1591 ÷ 19? (a) 80 (b) 800 (c) 40 (d) 160
  2. 2.Which is closest to 598 × 69? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  3. 3.Which is closest to 1203 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  4. 4.Round 77.41 to one decimal place. =
  5. 5.Round 73989 to the nearest thousand.
  6. 6.Round 27004 to the nearest ten.
  7. 7.Round 45.82 to one decimal place. =
  8. 8.Round 60496 to the nearest thousand.
  9. 9.Which is closest to 399 × 79? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  10. 10.Which is closest to 3602 ÷ 39? (a) 45 (b) 900 (c) 90 (d) 180
  11. 11.Round 32.71 to one decimal place. =
  12. 12.Which is closest to 603 + 499 + 595? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  13. 13.Which is closest to 596 + 796 + 404? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  14. 14.Round 13845 to the nearest hundred.
  15. 15.Which is closest to 201 + 195 + 402? (a) 700 (b) 1000 (c) 800 (d) 900
  16. 16.Which is closest to 203 × 52? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  17. 17.Round 58.21 to one decimal place. =
  18. 18.Which is closest to 3601 ÷ 39? (a) 900 (b) 90 (c) 180 (d) 45
  19. 19.Which is closest to 391 ÷ 21? (a) 10 (b) 20 (c) 40 (d) 200
  20. 20.Round 23711 to the nearest hundred.
  21. 21.Which is closest to 199 + 104 + 498? (a) 800 (b) 700 (c) 900 (d) 1000
  22. 22.Which is closest to 3495 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  23. 23.Which is closest to 502 × 41? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  24. 24.Which is closest to 798 + 503 + 395? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  25. 25.Round 24.88 to one decimal place. =
  26. 26.Which is closest to 2408 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  27. 27.Round 12332 to the nearest ten.
  28. 28.Round 22887 to the nearest hundred.
  29. 29.Which is closest to 1396 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  30. 30.Which is closest to 702 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  31. 31.Round 51.38 to one decimal place. =
  32. 32.Round 83758 to the nearest hundred.
  33. 33.Round 75936 to the nearest thousand.
  34. 34.Which is closest to 498 × 32? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  35. 35.Round 28.06 to one decimal place. =
  36. 36.Round 18.32 to one decimal place. =
  37. 37.Which is closest to 498 + 102 + 304? (a) 800 (b) 1000 (c) 1100 (d) 900
  38. 38.Which is closest to 403 + 97 + 696? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  39. 39.Which is closest to 593 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  40. 40.Round 28424 to the nearest hundred.

Answer key

  1. 80
  2. 42000
  3. 60
  4. 77.4
  5. 74000
  6. 27000
  7. 45.8
  8. 60000
  9. 32000
  10. 90
  11. 32.7
  12. 1700
  13. 1800
  14. 13800
  15. 800
  16. 10000
  17. 58.2
  18. 90
  19. 20
  20. 23700
  21. 800
  22. 70
  23. 20000
  24. 1700
  25. 24.9
  26. 80
  27. 12330
  28. 22900
  29. 70
  30. 56000
  31. 51.4
  32. 83800
  33. 76000
  34. 15000
  35. 28.1
  36. 18.3
  37. 900
  38. 1200
  39. 20
  40. 28400

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