← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 420 · 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 15011 to the nearest thousand.
  2. 2.Which is closest to 1607 ÷ 19? (a) 80 (b) 800 (c) 160 (d) 40
  3. 3.Which is closest to 599 × 32? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  4. 4.Round 60025 to the nearest hundred.
  5. 5.Which is closest to 701 × 18? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  6. 6.Which is closest to 198 + 500 + 500? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  7. 7.Round 68.67 to one decimal place. =
  8. 8.Which is closest to 304 × 29? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  9. 9.Which is closest to 97 + 95 + 298? (a) 400 (b) 500 (c) 600 (d) 700
  10. 10.Which is closest to 801 × 79? (Round each number first.) (a) 640000 (b) 6400 (c) 128000 (d) 64000
  11. 11.Round 84.33 to one decimal place. =
  12. 12.Which is closest to 796 × 71? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  13. 13.Round 78.13 to one decimal place. =
  14. 14.Which is closest to 98 + 595 + 401? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  15. 15.Round 89.26 to one decimal place. =
  16. 16.Which is closest to 591 ÷ 19? (a) 60 (b) 15 (c) 300 (d) 30
  17. 17.Which is closest to 398 × 51? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  18. 18.Which is closest to 4499 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  19. 19.Which is closest to 704 + 901 + 797? (a) 2400 (b) 2300 (c) 2500 (d) 2600
  20. 20.Round 44.74 to one decimal place. =
  21. 21.Round 31.23 to one decimal place. =
  22. 22.Which is closest to 202 × 79? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  23. 23.Which is closest to 897 × 20? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  24. 24.Round 66.77 to one decimal place. =
  25. 25.Which is closest to 503 + 495 + 102? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  26. 26.Round 72.91 to one decimal place. =
  27. 27.Which is closest to 3506 ÷ 51? (a) 70 (b) 140 (c) 700 (d) 35
  28. 28.Round 5488 to the nearest ten.
  29. 29.Which is closest to 697 × 49? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  30. 30.Which is closest to 596 × 90? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  31. 31.Round 89841 to the nearest ten.
  32. 32.Which is closest to 396 × 39? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  33. 33.Round 59317 to the nearest thousand.
  34. 34.Round 18.54 to one decimal place. =
  35. 35.Which is closest to 96 + 199 + 397? (a) 600 (b) 700 (c) 900 (d) 800
  36. 36.Round 31399 to the nearest hundred.
  37. 37.Round 97.62 to one decimal place. =
  38. 38.Which is closest to 803 × 32? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  39. 39.Which is closest to 802 × 41? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000
  40. 40.Which is closest to 702 + 705 + 204? (a) 1500 (b) 1600 (c) 1700 (d) 1800

Answer key

  1. 15000
  2. 80
  3. 18000
  4. 60000
  5. 14000
  6. 1200
  7. 68.7
  8. 9000
  9. 500
  10. 64000
  11. 84.3
  12. 56000
  13. 78.1
  14. 1100
  15. 89.3
  16. 30
  17. 20000
  18. 90
  19. 2400
  20. 44.7
  21. 31.2
  22. 16000
  23. 18000
  24. 66.8
  25. 1100
  26. 72.9
  27. 70
  28. 5490
  29. 35000
  30. 54000
  31. 89840
  32. 16000
  33. 59000
  34. 18.5
  35. 700
  36. 31400
  37. 97.6
  38. 24000
  39. 32000
  40. 1600

Free quantitative aptitude lessons, practice and worksheets at talentjr.in/quantitative-aptitude