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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 873 · 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.Round 59421 to the nearest thousand.
  2. 2.Which is closest to 900 × 89? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  3. 3.Round 37.07 to one decimal place. =
  4. 4.Round 19.26 to one decimal place. =
  5. 5.Which is closest to 497 × 18? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  6. 6.Round 33886 to the nearest hundred.
  7. 7.Which is closest to 800 ÷ 41? (a) 10 (b) 200 (c) 40 (d) 20
  8. 8.Which is closest to 397 + 304 + 203? (a) 1000 (b) 800 (c) 1100 (d) 900
  9. 9.Round 40981 to the nearest thousand.
  10. 10.Which is closest to 504 × 28? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  11. 11.Round 81.88 to one decimal place. =
  12. 12.Round 70505 to the nearest thousand.
  13. 13.Which is closest to 401 + 902 + 505? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  14. 14.Which is closest to 697 × 18? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  15. 15.Which is closest to 797 + 202 + 104? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  16. 16.Which is closest to 799 + 201 + 296? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  17. 17.Round 28.14 to one decimal place. =
  18. 18.Which is closest to 3009 ÷ 51? (a) 60 (b) 120 (c) 600 (d) 30
  19. 19.Which is closest to 295 + 498 + 403? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  20. 20.Which is closest to 99 + 195 + 604? (a) 800 (b) 1000 (c) 1100 (d) 900
  21. 21.Which is closest to 1494 ÷ 29? (a) 50 (b) 100 (c) 500 (d) 25
  22. 22.Round 22.94 to one decimal place. =
  23. 23.Round 38873 to the nearest hundred.
  24. 24.Round 78776 to the nearest ten.
  25. 25.Which is closest to 2495 ÷ 51? (a) 500 (b) 25 (c) 100 (d) 50
  26. 26.Which is closest to 1192 ÷ 29? (a) 80 (b) 40 (c) 400 (d) 20
  27. 27.Which is closest to 798 + 796 + 99? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  28. 28.Which is closest to 400 × 48? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  29. 29.Which is closest to 1805 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  30. 30.Which is closest to 497 + 301 + 799? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  31. 31.Which is closest to 901 × 59? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  32. 32.Which is closest to 203 × 50? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  33. 33.Which is closest to 502 × 31? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
  34. 34.Which is closest to 799 + 102 + 696? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  35. 35.Round 31363 to the nearest hundred.
  36. 36.Which is closest to 1596 ÷ 21? (a) 40 (b) 80 (c) 160 (d) 800
  37. 37.Round 94.49 to one decimal place. =
  38. 38.Which is closest to 394 ÷ 21? (a) 10 (b) 200 (c) 20 (d) 40
  39. 39.Round 42.21 to one decimal place. =
  40. 40.Round 38205 to the nearest thousand.

Answer key

  1. 59000
  2. 81000
  3. 37.1
  4. 19.3
  5. 10000
  6. 33900
  7. 20
  8. 900
  9. 41000
  10. 15000
  11. 81.9
  12. 71000
  13. 1800
  14. 14000
  15. 1100
  16. 1300
  17. 28.1
  18. 60
  19. 1200
  20. 900
  21. 50
  22. 22.9
  23. 38900
  24. 78780
  25. 50
  26. 40
  27. 1700
  28. 20000
  29. 60
  30. 1600
  31. 54000
  32. 10000
  33. 15000
  34. 1600
  35. 31400
  36. 80
  37. 94.5
  38. 20
  39. 42.2
  40. 38000

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