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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 990 · 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 499 × 32? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  2. 2.Which is closest to 497 × 40? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  3. 3.Round 11.07 to one decimal place. =
  4. 4.Round 92.73 to one decimal place. =
  5. 5.Which is closest to 1192 ÷ 19? (a) 30 (b) 600 (c) 60 (d) 120
  6. 6.Which is closest to 296 + 602 + 503? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  7. 7.Which is closest to 297 + 595 + 296? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  8. 8.Which is closest to 196 + 200 + 603? (a) 1100 (b) 1200 (c) 1000 (d) 900
  9. 9.Round 19.49 to one decimal place. =
  10. 10.Round 73.21 to one decimal place. =
  11. 11.Which is closest to 304 + 702 + 902? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  12. 12.Which is closest to 791 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
  13. 13.Which is closest to 1994 ÷ 39? (a) 50 (b) 500 (c) 25 (d) 100
  14. 14.Which is closest to 603 × 41? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  15. 15.Round 19.37 to one decimal place. =
  16. 16.Round 76.56 to one decimal place. =
  17. 17.Which is closest to 1402 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  18. 18.Which is closest to 303 + 796 + 303? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  19. 19.Round 74224 to the nearest hundred.
  20. 20.Which is closest to 95 + 898 + 100? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  21. 21.Round 62.91 to one decimal place. =
  22. 22.Which is closest to 4492 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  23. 23.Round 31.16 to one decimal place. =
  24. 24.Which is closest to 397 + 701 + 497? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  25. 25.Which is closest to 202 + 503 + 505? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  26. 26.Which is closest to 402 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40
  27. 27.Which is closest to 402 × 92? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  28. 28.Round 28.37 to one decimal place. =
  29. 29.Round 30.36 to one decimal place. =
  30. 30.Which is closest to 201 × 52? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  31. 31.Round 62.58 to one decimal place. =
  32. 32.Which is closest to 402 + 696 + 197? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  33. 33.Round 60.16 to one decimal place. =
  34. 34.Which is closest to 802 + 397 + 895? (a) 2300 (b) 2200 (c) 2000 (d) 2100
  35. 35.Which is closest to 804 + 701 + 496? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  36. 36.Which is closest to 1207 ÷ 19? (a) 30 (b) 60 (c) 600 (d) 120
  37. 37.Which is closest to 395 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  38. 38.Which is closest to 196 × 79? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  39. 39.Which is closest to 796 × 88? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  40. 40.Round 88.18 to one decimal place. =

Answer key

  1. 15000
  2. 20000
  3. 11.1
  4. 92.7
  5. 60
  6. 1400
  7. 1200
  8. 1000
  9. 19.5
  10. 73.2
  11. 1900
  12. 40
  13. 50
  14. 24000
  15. 19.4
  16. 76.6
  17. 70
  18. 1400
  19. 74200
  20. 1100
  21. 62.9
  22. 90
  23. 31.2
  24. 1600
  25. 1200
  26. 20
  27. 36000
  28. 28.4
  29. 30.4
  30. 10000
  31. 62.6
  32. 1300
  33. 60.2
  34. 2100
  35. 2000
  36. 60
  37. 20
  38. 16000
  39. 72000
  40. 88.2

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