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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 622 · 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 899 + 404 + 201? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  2. 2.Which is closest to 702 × 60? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  3. 3.Round 68028 to the nearest ten.
  4. 4.Which is closest to 697 × 31? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  5. 5.Which is closest to 902 × 68? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  6. 6.Which is closest to 902 × 52? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  7. 7.Round 71.22 to one decimal place. =
  8. 8.Round 72586 to the nearest thousand.
  9. 9.Which is closest to 298 + 299 + 96? (a) 800 (b) 700 (c) 900 (d) 600
  10. 10.Round 74.47 to one decimal place. =
  11. 11.Which is closest to 304 + 702 + 398? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  12. 12.Round 64122 to the nearest ten.
  13. 13.Which is closest to 899 + 701 + 698? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  14. 14.Round 10449 to the nearest ten.
  15. 15.Which is closest to 399 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  16. 16.Round 74889 to the nearest hundred.
  17. 17.Which is closest to 301 × 70? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  18. 18.Which is closest to 993 ÷ 21? (a) 25 (b) 50 (c) 500 (d) 100
  19. 19.Round 32.68 to one decimal place. =
  20. 20.Round 80248 to the nearest thousand.
  21. 21.Which is closest to 97 + 399 + 895? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  22. 22.Which is closest to 201 + 497 + 504? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  23. 23.Round 55.74 to one decimal place. =
  24. 24.Round 76259 to the nearest thousand.
  25. 25.Round 73.14 to one decimal place. =
  26. 26.Which is closest to 496 × 89? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  27. 27.Which is closest to 2406 ÷ 41? (a) 120 (b) 30 (c) 600 (d) 60
  28. 28.Which is closest to 3596 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  29. 29.Which is closest to 697 × 59? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  30. 30.Which is closest to 800 × 38? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000
  31. 31.Which is closest to 796 × 71? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  32. 32.Which is closest to 899 + 505 + 98? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  33. 33.Which is closest to 1991 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  34. 34.Which is closest to 597 × 60? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  35. 35.Which is closest to 793 ÷ 41? (a) 20 (b) 40 (c) 200 (d) 10
  36. 36.Which is closest to 1999 ÷ 41? (a) 50 (b) 100 (c) 500 (d) 25
  37. 37.Round 25144 to the nearest hundred.
  38. 38.Round 58.12 to one decimal place. =
  39. 39.Which is closest to 1006 ÷ 49? (a) 10 (b) 40 (c) 200 (d) 20
  40. 40.Which is closest to 1501 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60

Answer key

  1. 1500
  2. 42000
  3. 68030
  4. 21000
  5. 63000
  6. 45000
  7. 71.2
  8. 73000
  9. 700
  10. 74.5
  11. 1400
  12. 64120
  13. 2300
  14. 10450
  15. 12000
  16. 74900
  17. 21000
  18. 50
  19. 32.7
  20. 80000
  21. 1400
  22. 1200
  23. 55.7
  24. 76000
  25. 73.1
  26. 45000
  27. 60
  28. 90
  29. 42000
  30. 32000
  31. 56000
  32. 1500
  33. 50
  34. 36000
  35. 20
  36. 50
  37. 25100
  38. 58.1
  39. 20
  40. 30

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