← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 79 · 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 200 + 199 + 502? (a) 800 (b) 1100 (c) 1000 (d) 900
  2. 2.Round 70.78 to one decimal place. =
  3. 3.Which is closest to 697 × 21? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  4. 4.Round 15.14 to one decimal place. =
  5. 5.Round 90.44 to one decimal place. =
  6. 6.Round 86.62 to one decimal place. =
  7. 7.Which is closest to 302 + 902 + 504? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  8. 8.Which is closest to 602 × 30? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  9. 9.Round 32724 to the nearest thousand.
  10. 10.Which is closest to 303 × 40? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  11. 11.Round 37.17 to one decimal place. =
  12. 12.Round 15158 to the nearest ten.
  13. 13.Round 50723 to the nearest ten.
  14. 14.Round 15.16 to one decimal place. =
  15. 15.Round 36.12 to one decimal place. =
  16. 16.Round 57.31 to one decimal place. =
  17. 17.Which is closest to 498 × 28? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  18. 18.Which is closest to 1792 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  19. 19.Which is closest to 702 + 695 + 99? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  20. 20.Round 58.51 to one decimal place. =
  21. 21.Which is closest to 499 + 199 + 797? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  22. 22.Which is closest to 104 + 95 + 505? (a) 600 (b) 700 (c) 900 (d) 800
  23. 23.Which is closest to 1593 ÷ 41? (a) 400 (b) 20 (c) 80 (d) 40
  24. 24.Which is closest to 903 × 81? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  25. 25.Which is closest to 497 × 38? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  26. 26.Which is closest to 304 + 305 + 700? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  27. 27.Round 30.37 to one decimal place. =
  28. 28.Which is closest to 304 + 202 + 795? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  29. 29.Round 65.07 to one decimal place. =
  30. 30.Round 20.09 to one decimal place. =
  31. 31.Which is closest to 104 + 200 + 97? (a) 600 (b) 400 (c) 300 (d) 500
  32. 32.Which is closest to 900 ÷ 29? (a) 300 (b) 60 (c) 30 (d) 15
  33. 33.Which is closest to 398 × 80? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  34. 34.Which is closest to 405 + 397 + 504? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  35. 35.Which is closest to 197 + 101 + 798? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  36. 36.Round 93.53 to one decimal place. =
  37. 37.Which is closest to 805 + 795 + 705? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  38. 38.Which is closest to 498 + 202 + 700? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  39. 39.Round 61.28 to one decimal place. =
  40. 40.Which is closest to 598 + 601 + 595? (a) 1700 (b) 1800 (c) 2000 (d) 1900

Answer key

  1. 900
  2. 70.8
  3. 14000
  4. 15.1
  5. 90.4
  6. 86.6
  7. 1700
  8. 18000
  9. 33000
  10. 12000
  11. 37.2
  12. 15160
  13. 50720
  14. 15.2
  15. 36.1
  16. 57.3
  17. 15000
  18. 90
  19. 1500
  20. 58.5
  21. 1500
  22. 700
  23. 40
  24. 72000
  25. 20000
  26. 1300
  27. 30.4
  28. 1300
  29. 65.1
  30. 20.1
  31. 400
  32. 30
  33. 32000
  34. 1300
  35. 1100
  36. 93.5
  37. 2300
  38. 1400
  39. 61.3
  40. 1800

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