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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 422 · 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 60237 to the nearest ten.
  2. 2.Round 51.84 to one decimal place. =
  3. 3.Which is closest to 794 ÷ 21? (a) 80 (b) 400 (c) 20 (d) 40
  4. 4.Which is closest to 200 × 51? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  5. 5.Round 40.41 to one decimal place. =
  6. 6.Round 95589 to the nearest ten.
  7. 7.Round 46.88 to one decimal place. =
  8. 8.Round 74656 to the nearest thousand.
  9. 9.Which is closest to 298 × 61? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  10. 10.Which is closest to 2403 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  11. 11.Round 54.62 to one decimal place. =
  12. 12.Round 76.31 to one decimal place. =
  13. 13.Which is closest to 1202 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  14. 14.Which is closest to 2995 ÷ 51? (a) 120 (b) 60 (c) 30 (d) 600
  15. 15.Which is closest to 600 × 19? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  16. 16.Which is closest to 608 ÷ 29? (a) 40 (b) 20 (c) 10 (d) 200
  17. 17.Which is closest to 604 × 38? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  18. 18.Round 70.37 to one decimal place. =
  19. 19.Which is closest to 102 + 895 + 599? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  20. 20.Which is closest to 999 ÷ 51? (a) 40 (b) 200 (c) 20 (d) 10
  21. 21.Which is closest to 1192 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60
  22. 22.Which is closest to 202 × 80? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  23. 23.Round 27.93 to one decimal place. =
  24. 24.Which is closest to 1402 ÷ 21? (a) 35 (b) 140 (c) 700 (d) 70
  25. 25.Which is closest to 199 + 397 + 804? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  26. 26.Which is closest to 800 + 205 + 801? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  27. 27.Round 46205 to the nearest hundred.
  28. 28.Which is closest to 701 × 30? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  29. 29.Round 78.92 to one decimal place. =
  30. 30.Which is closest to 100 + 105 + 804? (a) 900 (b) 1200 (c) 1100 (d) 1000
  31. 31.Round 29183 to the nearest ten.
  32. 32.Which is closest to 502 × 51? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  33. 33.Which is closest to 3498 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  34. 34.Which is closest to 299 × 31? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  35. 35.Which is closest to 1400 ÷ 19? (a) 700 (b) 140 (c) 70 (d) 35
  36. 36.Which is closest to 599 ÷ 19? (a) 60 (b) 300 (c) 15 (d) 30
  37. 37.Round 62.57 to one decimal place. =
  38. 38.Which is closest to 896 × 68? (Round each number first.) (a) 63000 (b) 6300 (c) 630000 (d) 126000
  39. 39.Which is closest to 501 × 51? (Round each number first.) (a) 2500 (b) 50000 (c) 250000 (d) 25000
  40. 40.Round 85.11 to one decimal place. =

Answer key

  1. 60240
  2. 51.8
  3. 40
  4. 10000
  5. 40.4
  6. 95590
  7. 46.9
  8. 75000
  9. 18000
  10. 60
  11. 54.6
  12. 76.3
  13. 60
  14. 60
  15. 12000
  16. 20
  17. 24000
  18. 70.4
  19. 1600
  20. 20
  21. 60
  22. 16000
  23. 27.9
  24. 70
  25. 1400
  26. 1800
  27. 46200
  28. 21000
  29. 78.9
  30. 1000
  31. 29180
  32. 25000
  33. 70
  34. 9000
  35. 70
  36. 30
  37. 62.6
  38. 63000
  39. 25000
  40. 85.1

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