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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 659 · 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 402 × 38? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  2. 2.Which is closest to 804 × 31? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  3. 3.Round 14.84 to one decimal place. =
  4. 4.Which is closest to 1595 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  5. 5.Which is closest to 606 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  6. 6.Which is closest to 1509 ÷ 31? (a) 500 (b) 100 (c) 50 (d) 25
  7. 7.Round 70.79 to one decimal place. =
  8. 8.Which is closest to 1595 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  9. 9.Which is closest to 600 + 795 + 497? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  10. 10.Which is closest to 498 + 304 + 197? (a) 1200 (b) 1000 (c) 900 (d) 1100
  11. 11.Which is closest to 701 × 80? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
  12. 12.Which is closest to 399 + 504 + 201? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  13. 13.Which is closest to 2695 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  14. 14.Round 30846 to the nearest ten.
  15. 15.Which is closest to 301 × 48? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  16. 16.Round 23522 to the nearest thousand.
  17. 17.Which is closest to 3201 ÷ 39? (a) 800 (b) 80 (c) 160 (d) 40
  18. 18.Which is closest to 1797 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  19. 19.Round 14.16 to one decimal place. =
  20. 20.Round 79.31 to one decimal place. =
  21. 21.Round 79.87 to one decimal place. =
  22. 22.Which is closest to 505 + 195 + 195? (a) 1000 (b) 1100 (c) 800 (d) 900
  23. 23.Which is closest to 896 × 82? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  24. 24.Which is closest to 697 + 900 + 701? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  25. 25.Which is closest to 404 × 22? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  26. 26.Which is closest to 799 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  27. 27.Which is closest to 502 + 499 + 195? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  28. 28.Which is closest to 796 + 201 + 102? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  29. 29.Round 27.63 to one decimal place. =
  30. 30.Round 37.67 to one decimal place. =
  31. 31.Which is closest to 98 + 196 + 303? (a) 700 (b) 600 (c) 500 (d) 800
  32. 32.Which is closest to 800 + 895 + 605? (a) 2400 (b) 2300 (c) 2200 (d) 2500
  33. 33.Which is closest to 598 × 79? (Round each number first.) (a) 96000 (b) 480000 (c) 48000 (d) 4800
  34. 34.Which is closest to 795 + 404 + 603? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  35. 35.Which is closest to 805 + 705 + 202? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  36. 36.Which is closest to 502 × 49? (Round each number first.) (a) 25000 (b) 2500 (c) 50000 (d) 250000
  37. 37.Which is closest to 599 + 297 + 497? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  38. 38.Round 33.41 to one decimal place. =
  39. 39.Round 21.56 to one decimal place. =
  40. 40.Which is closest to 404 × 80? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000

Answer key

  1. 16000
  2. 24000
  3. 14.8
  4. 80
  5. 30
  6. 50
  7. 70.8
  8. 40
  9. 1900
  10. 1000
  11. 56000
  12. 1100
  13. 90
  14. 30850
  15. 15000
  16. 24000
  17. 80
  18. 60
  19. 14.2
  20. 79.3
  21. 79.9
  22. 900
  23. 72000
  24. 2300
  25. 8000
  26. 24000
  27. 1200
  28. 1100
  29. 27.6
  30. 37.7
  31. 600
  32. 2300
  33. 48000
  34. 1800
  35. 1700
  36. 25000
  37. 1400
  38. 33.4
  39. 21.6
  40. 32000

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