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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 544 · 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 305 + 597 + 899? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  2. 2.Round 58881 to the nearest thousand.
  3. 3.Which is closest to 296 × 52? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  4. 4.Round 18585 to the nearest hundred.
  5. 5.Which is closest to 95 + 595 + 495? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  6. 6.Round 33.27 to one decimal place. =
  7. 7.Which is closest to 904 ÷ 31? (a) 15 (b) 30 (c) 60 (d) 300
  8. 8.Which is closest to 1005 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  9. 9.Round 15.21 to one decimal place. =
  10. 10.Which is closest to 602 × 38? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  11. 11.Which is closest to 604 × 71? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
  12. 12.Round 88024 to the nearest thousand.
  13. 13.Round 37.72 to one decimal place. =
  14. 14.Which is closest to 1401 ÷ 19? (a) 70 (b) 700 (c) 35 (d) 140
  15. 15.Which is closest to 2095 ÷ 31? (a) 35 (b) 700 (c) 70 (d) 140
  16. 16.Which is closest to 598 × 89? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  17. 17.Round 12.38 to one decimal place. =
  18. 18.Which is closest to 1807 ÷ 21? (a) 180 (b) 900 (c) 45 (d) 90
  19. 19.Which is closest to 804 × 50? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  20. 20.Which is closest to 603 + 598 + 396? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  21. 21.Round 18989 to the nearest ten.
  22. 22.Round 48.71 to one decimal place. =
  23. 23.Which is closest to 798 × 40? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  24. 24.Which is closest to 597 + 502 + 496? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  25. 25.Which is closest to 407 ÷ 21? (a) 20 (b) 40 (c) 10 (d) 200
  26. 26.Which is closest to 501 × 41? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  27. 27.Which is closest to 1491 ÷ 49? (a) 60 (b) 30 (c) 15 (d) 300
  28. 28.Round 17172 to the nearest thousand.
  29. 29.Round 93.42 to one decimal place. =
  30. 30.Round 12.93 to one decimal place. =
  31. 31.Which is closest to 499 × 51? (Round each number first.) (a) 2500 (b) 25000 (c) 50000 (d) 250000
  32. 32.Which is closest to 892 ÷ 31? (a) 300 (b) 15 (c) 60 (d) 30
  33. 33.Which is closest to 596 × 62? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  34. 34.Which is closest to 397 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  35. 35.Which is closest to 103 + 596 + 398? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  36. 36.Round 11.67 to one decimal place. =
  37. 37.Which is closest to 395 + 705 + 896? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  38. 38.Which is closest to 1802 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  39. 39.Which is closest to 2800 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  40. 40.Round 94757 to the nearest ten.

Answer key

  1. 1800
  2. 59000
  3. 15000
  4. 18600
  5. 1200
  6. 33.3
  7. 30
  8. 50
  9. 15.2
  10. 24000
  11. 42000
  12. 88000
  13. 37.7
  14. 70
  15. 70
  16. 54000
  17. 12.4
  18. 90
  19. 40000
  20. 1600
  21. 18990
  22. 48.7
  23. 32000
  24. 1600
  25. 20
  26. 20000
  27. 30
  28. 17000
  29. 93.4
  30. 12.9
  31. 25000
  32. 30
  33. 36000
  34. 12000
  35. 1100
  36. 11.7
  37. 2000
  38. 60
  39. 70
  40. 94760

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