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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 706 · 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 × 19? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  2. 2.Round 90.54 to one decimal place. =
  3. 3.Round 85.78 to one decimal place. =
  4. 4.Which is closest to 1591 ÷ 19? (a) 40 (b) 800 (c) 160 (d) 80
  5. 5.Which is closest to 201 + 405 + 701? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  6. 6.Which is closest to 2092 ÷ 29? (a) 35 (b) 70 (c) 700 (d) 140
  7. 7.Round 25.57 to one decimal place. =
  8. 8.Which is closest to 602 × 32? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  9. 9.Which is closest to 2695 ÷ 31? (a) 45 (b) 900 (c) 90 (d) 180
  10. 10.Which is closest to 301 × 21? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  11. 11.Round 22.27 to one decimal place. =
  12. 12.Round 38991 to the nearest ten.
  13. 13.Which is closest to 196 × 80? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  14. 14.Which is closest to 204 × 39? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  15. 15.Which is closest to 303 × 49? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  16. 16.Round 59.61 to one decimal place. =
  17. 17.Which is closest to 2395 ÷ 29? (a) 40 (b) 160 (c) 800 (d) 80
  18. 18.Round 88.11 to one decimal place. =
  19. 19.Which is closest to 697 × 81? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  20. 20.Round 80548 to the nearest ten.
  21. 21.Which is closest to 897 × 62? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  22. 22.Which is closest to 704 × 21? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  23. 23.Round 74.83 to one decimal place. =
  24. 24.Which is closest to 797 × 72? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  25. 25.Round 4375 to the nearest thousand.
  26. 26.Which is closest to 705 + 605 + 705? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  27. 27.Round 36.11 to one decimal place. =
  28. 28.Round 91346 to the nearest ten.
  29. 29.Which is closest to 197 + 802 + 195? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  30. 30.Which is closest to 1205 ÷ 19? (a) 60 (b) 600 (c) 120 (d) 30
  31. 31.Round 61.82 to one decimal place. =
  32. 32.Which is closest to 2699 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  33. 33.Round 10.24 to one decimal place. =
  34. 34.Which is closest to 704 + 905 + 705? (a) 2200 (b) 2300 (c) 2500 (d) 2400
  35. 35.Round 6646 to the nearest ten.
  36. 36.Which is closest to 704 × 30? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  37. 37.Which is closest to 3495 ÷ 51? (a) 35 (b) 70 (c) 700 (d) 140
  38. 38.Which is closest to 897 × 79? (Round each number first.) (a) 72000 (b) 144000 (c) 7200 (d) 720000
  39. 39.Round 76.63 to one decimal place. =
  40. 40.Which is closest to 596 × 42? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000

Answer key

  1. 4000
  2. 90.5
  3. 85.8
  4. 80
  5. 1300
  6. 70
  7. 25.6
  8. 18000
  9. 90
  10. 6000
  11. 22.3
  12. 38990
  13. 16000
  14. 8000
  15. 15000
  16. 59.6
  17. 80
  18. 88.1
  19. 56000
  20. 80550
  21. 54000
  22. 14000
  23. 74.8
  24. 56000
  25. 4000
  26. 2000
  27. 36.1
  28. 91350
  29. 1200
  30. 60
  31. 61.8
  32. 90
  33. 10.2
  34. 2300
  35. 6650
  36. 21000
  37. 70
  38. 72000
  39. 76.6
  40. 24000

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