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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 890 · 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.Round 10647 to the nearest thousand.
  2. 2.Which is closest to 902 × 19? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  3. 3.Which is closest to 302 × 62? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  4. 4.Which is closest to 2796 ÷ 41? (a) 35 (b) 700 (c) 140 (d) 70
  5. 5.Which is closest to 2396 ÷ 31? (a) 80 (b) 800 (c) 40 (d) 160
  6. 6.Which is closest to 500 + 300 + 795? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  7. 7.Which is closest to 496 × 52? (Round each number first.) (a) 2500 (b) 50000 (c) 250000 (d) 25000
  8. 8.Which is closest to 697 × 31? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  9. 9.Round 29.23 to one decimal place. =
  10. 10.Round 7081 to the nearest thousand.
  11. 11.Which is closest to 2406 ÷ 31? (a) 40 (b) 160 (c) 80 (d) 800
  12. 12.Round 48.68 to one decimal place. =
  13. 13.Which is closest to 101 + 501 + 795? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  14. 14.Which is closest to 597 + 397 + 295? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  15. 15.Which is closest to 608 ÷ 21? (a) 60 (b) 15 (c) 30 (d) 300
  16. 16.Which is closest to 898 × 58? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  17. 17.Round 19.12 to one decimal place. =
  18. 18.Round 65.76 to one decimal place. =
  19. 19.Which is closest to 198 × 52? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  20. 20.Which is closest to 603 + 102 + 195? (a) 1100 (b) 1000 (c) 900 (d) 800
  21. 21.Which is closest to 902 + 703 + 403? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  22. 22.Round 45.37 to one decimal place. =
  23. 23.Which is closest to 702 + 696 + 702? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  24. 24.Round 51194 to the nearest hundred.
  25. 25.Which is closest to 97 + 297 + 396? (a) 700 (b) 1000 (c) 900 (d) 800
  26. 26.Round 44.89 to one decimal place. =
  27. 27.Which is closest to 496 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  28. 28.Round 51839 to the nearest hundred.
  29. 29.Round 64062 to the nearest thousand.
  30. 30.Round 72037 to the nearest hundred.
  31. 31.Round 68.13 to one decimal place. =
  32. 32.Round 25.83 to one decimal place. =
  33. 33.Which is closest to 604 ÷ 21? (a) 60 (b) 15 (c) 300 (d) 30
  34. 34.Which is closest to 1591 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  35. 35.Which is closest to 594 ÷ 19? (a) 300 (b) 60 (c) 30 (d) 15
  36. 36.Which is closest to 399 × 31? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  37. 37.Which is closest to 2701 ÷ 29? (a) 45 (b) 900 (c) 90 (d) 180
  38. 38.Round 88.31 to one decimal place. =
  39. 39.Which is closest to 1191 ÷ 41? (a) 300 (b) 30 (c) 15 (d) 60
  40. 40.Which is closest to 802 + 304 + 96? (a) 1200 (b) 1400 (c) 1100 (d) 1300

Answer key

  1. 11000
  2. 18000
  3. 18000
  4. 70
  5. 80
  6. 1600
  7. 25000
  8. 21000
  9. 29.2
  10. 7000
  11. 80
  12. 48.7
  13. 1400
  14. 1300
  15. 30
  16. 54000
  17. 19.1
  18. 65.8
  19. 10000
  20. 900
  21. 2000
  22. 45.4
  23. 2100
  24. 51200
  25. 800
  26. 44.9
  27. 25000
  28. 51800
  29. 64000
  30. 72000
  31. 68.1
  32. 25.8
  33. 30
  34. 80
  35. 30
  36. 12000
  37. 90
  38. 88.3
  39. 30
  40. 1200

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