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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 351 · 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 201 × 52? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  2. 2.Which is closest to 799 + 597 + 401? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  3. 3.Which is closest to 303 × 82? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  4. 4.Round 37009 to the nearest ten.
  5. 5.Which is closest to 802 ÷ 21? (a) 80 (b) 400 (c) 40 (d) 20
  6. 6.Which is closest to 103 + 500 + 597? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  7. 7.Which is closest to 496 × 32? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  8. 8.Round 50.47 to one decimal place. =
  9. 9.Which is closest to 400 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  10. 10.Which is closest to 896 + 799 + 95? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  11. 11.Which is closest to 498 + 597 + 301? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  12. 12.Round 26323 to the nearest ten.
  13. 13.Round 27568 to the nearest hundred.
  14. 14.Round 99606 to the nearest ten.
  15. 15.Which is closest to 1503 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  16. 16.Round 63.41 to one decimal place. =
  17. 17.Which is closest to 497 × 52? (Round each number first.) (a) 250000 (b) 25000 (c) 50000 (d) 2500
  18. 18.Round 16861 to the nearest thousand.
  19. 19.Which is closest to 796 + 199 + 97? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  20. 20.Which is closest to 799 + 797 + 899? (a) 2400 (b) 2700 (c) 2500 (d) 2600
  21. 21.Which is closest to 597 × 22? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  22. 22.Which is closest to 798 + 499 + 401? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  23. 23.Which is closest to 704 × 31? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  24. 24.Round 11.32 to one decimal place. =
  25. 25.Round 18.48 to one decimal place. =
  26. 26.Which is closest to 503 + 599 + 95? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  27. 27.Which is closest to 3592 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  28. 28.Round 57.94 to one decimal place. =
  29. 29.Which is closest to 300 + 800 + 395? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  30. 30.Which is closest to 602 × 40? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  31. 31.Which is closest to 496 × 82? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  32. 32.Which is closest to 105 + 395 + 100? (a) 600 (b) 500 (c) 700 (d) 800
  33. 33.Round 21.54 to one decimal place. =
  34. 34.Which is closest to 103 + 300 + 305? (a) 800 (b) 700 (c) 600 (d) 900
  35. 35.Which is closest to 200 + 705 + 305? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  36. 36.Which is closest to 499 × 48? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  37. 37.Round 2687 to the nearest thousand.
  38. 38.Which is closest to 503 + 201 + 704? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  39. 39.Round 75083 to the nearest thousand.
  40. 40.Which is closest to 1796 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60

Answer key

  1. 10000
  2. 1800
  3. 24000
  4. 37010
  5. 40
  6. 1200
  7. 15000
  8. 50.5
  9. 20
  10. 1800
  11. 1400
  12. 26320
  13. 27600
  14. 99610
  15. 30
  16. 63.4
  17. 25000
  18. 17000
  19. 1100
  20. 2500
  21. 12000
  22. 1700
  23. 21000
  24. 11.3
  25. 18.5
  26. 1200
  27. 90
  28. 57.9
  29. 1500
  30. 24000
  31. 40000
  32. 600
  33. 21.5
  34. 700
  35. 1200
  36. 25000
  37. 3000
  38. 1400
  39. 75000
  40. 60

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