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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 870 · 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 302 + 201 + 395? (a) 1000 (b) 800 (c) 900 (d) 1100
  2. 2.Which is closest to 699 + 703 + 102? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  3. 3.Round 5521 to the nearest thousand.
  4. 4.Round 64.43 to one decimal place. =
  5. 5.Round 31.52 to one decimal place. =
  6. 6.Which is closest to 197 × 39? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  7. 7.Which is closest to 802 × 89? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  8. 8.Round 14.46 to one decimal place. =
  9. 9.Round 23.83 to one decimal place. =
  10. 10.Round 52032 to the nearest ten.
  11. 11.Round 25.91 to one decimal place. =
  12. 12.Round 50.58 to one decimal place. =
  13. 13.Round 78979 to the nearest hundred.
  14. 14.Which is closest to 798 × 49? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000
  15. 15.Which is closest to 101 + 703 + 197? (a) 1100 (b) 1200 (c) 1000 (d) 900
  16. 16.Which is closest to 1392 ÷ 21? (a) 70 (b) 35 (c) 140 (d) 700
  17. 17.Which is closest to 505 + 95 + 798? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  18. 18.Round 74.08 to one decimal place. =
  19. 19.Which is closest to 303 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  20. 20.Which is closest to 607 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  21. 21.Which is closest to 805 + 696 + 602? (a) 2000 (b) 2300 (c) 2100 (d) 2200
  22. 22.Which is closest to 396 × 40? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  23. 23.Which is closest to 400 + 398 + 301? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  24. 24.Which is closest to 596 + 695 + 595? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  25. 25.Which is closest to 205 + 803 + 698? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  26. 26.Which is closest to 797 × 19? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  27. 27.Round 39448 to the nearest ten.
  28. 28.Which is closest to 701 × 28? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
  29. 29.Which is closest to 808 ÷ 41? (a) 20 (b) 10 (c) 40 (d) 200
  30. 30.Which is closest to 199 × 42? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  31. 31.Round 66.14 to one decimal place. =
  32. 32.Round 56.58 to one decimal place. =
  33. 33.Round 89.61 to one decimal place. =
  34. 34.Which is closest to 799 × 68? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  35. 35.Which is closest to 396 + 595 + 798? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  36. 36.Round 62.34 to one decimal place. =
  37. 37.Which is closest to 700 + 798 + 195? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  38. 38.Round 20872 to the nearest hundred.
  39. 39.Which is closest to 701 × 19? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  40. 40.Which is closest to 1800 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45

Answer key

  1. 900
  2. 1500
  3. 6000
  4. 64.4
  5. 31.5
  6. 8000
  7. 72000
  8. 14.5
  9. 23.8
  10. 52030
  11. 25.9
  12. 50.6
  13. 79000
  14. 40000
  15. 1000
  16. 70
  17. 1400
  18. 74.1
  19. 18000
  20. 20
  21. 2100
  22. 16000
  23. 1100
  24. 1900
  25. 1700
  26. 16000
  27. 39450
  28. 21000
  29. 20
  30. 8000
  31. 66.1
  32. 56.6
  33. 89.6
  34. 56000
  35. 1800
  36. 62.3
  37. 1700
  38. 20900
  39. 14000
  40. 90

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