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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 776 · 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 403 × 30? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  2. 2.Which is closest to 805 + 505 + 303? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  3. 3.Round 59.26 to one decimal place. =
  4. 4.Which is closest to 1391 ÷ 21? (a) 70 (b) 700 (c) 140 (d) 35
  5. 5.Which is closest to 804 × 18? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  6. 6.Which is closest to 498 × 31? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  7. 7.Which is closest to 1193 ÷ 39? (a) 15 (b) 300 (c) 30 (d) 60
  8. 8.Round 42416 to the nearest hundred.
  9. 9.Round 34.33 to one decimal place. =
  10. 10.Round 21248 to the nearest ten.
  11. 11.Which is closest to 200 × 48? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  12. 12.Round 94.12 to one decimal place. =
  13. 13.Which is closest to 496 × 89? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  14. 14.Which is closest to 2705 ÷ 31? (a) 900 (b) 90 (c) 45 (d) 180
  15. 15.Which is closest to 698 × 62? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  16. 16.Which is closest to 3206 ÷ 39? (a) 80 (b) 800 (c) 40 (d) 160
  17. 17.Round 93.23 to one decimal place. =
  18. 18.Round 49849 to the nearest thousand.
  19. 19.Round 88.06 to one decimal place. =
  20. 20.Which is closest to 801 × 38? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  21. 21.Round 90783 to the nearest ten.
  22. 22.Which is closest to 599 × 61? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  23. 23.Which is closest to 299 × 61? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  24. 24.Round 36129 to the nearest ten.
  25. 25.Round 2684 to the nearest thousand.
  26. 26.Round 91.92 to one decimal place. =
  27. 27.Round 73359 to the nearest ten.
  28. 28.Which is closest to 502 × 52? (Round each number first.) (a) 2500 (b) 250000 (c) 25000 (d) 50000
  29. 29.Round 16.54 to one decimal place. =
  30. 30.Which is closest to 203 × 68? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  31. 31.Which is closest to 199 × 72? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  32. 32.Which is closest to 2006 ÷ 39? (a) 50 (b) 100 (c) 25 (d) 500
  33. 33.Which is closest to 2005 ÷ 39? (a) 100 (b) 500 (c) 25 (d) 50
  34. 34.Round 38.87 to one decimal place. =
  35. 35.Which is closest to 600 × 29? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  36. 36.Round 6917 to the nearest thousand.
  37. 37.Which is closest to 297 × 42? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  38. 38.Which is closest to 605 + 798 + 701? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  39. 39.Round 17.94 to one decimal place. =
  40. 40.Which is closest to 4006 ÷ 51? (a) 40 (b) 800 (c) 80 (d) 160

Answer key

  1. 12000
  2. 1600
  3. 59.3
  4. 70
  5. 16000
  6. 15000
  7. 30
  8. 42400
  9. 34.3
  10. 21250
  11. 10000
  12. 94.1
  13. 45000
  14. 90
  15. 42000
  16. 80
  17. 93.2
  18. 50000
  19. 88.1
  20. 32000
  21. 90780
  22. 36000
  23. 18000
  24. 36130
  25. 3000
  26. 91.9
  27. 73360
  28. 25000
  29. 16.5
  30. 14000
  31. 14000
  32. 50
  33. 50
  34. 38.9
  35. 18000
  36. 7000
  37. 12000
  38. 2100
  39. 17.9
  40. 80

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