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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 631 · 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 203 × 18? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  2. 2.Round 24153 to the nearest thousand.
  3. 3.Which is closest to 401 × 19? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  4. 4.Which is closest to 499 × 38? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  5. 5.Which is closest to 202 + 795 + 797? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  6. 6.Which is closest to 798 × 38? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  7. 7.Round 64848 to the nearest thousand.
  8. 8.Which is closest to 702 + 798 + 100? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  9. 9.Round 27.77 to one decimal place. =
  10. 10.Which is closest to 598 × 38? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  11. 11.Which is closest to 1991 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
  12. 12.Round 46986 to the nearest ten.
  13. 13.Which is closest to 498 × 19? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  14. 14.Round 28.24 to one decimal place. =
  15. 15.Which is closest to 796 + 898 + 299? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  16. 16.Which is closest to 196 + 195 + 697? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  17. 17.Which is closest to 400 + 704 + 299? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  18. 18.Round 71111 to the nearest thousand.
  19. 19.Round 90.44 to one decimal place. =
  20. 20.Which is closest to 803 × 19? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  21. 21.Round 36.86 to one decimal place. =
  22. 22.Which is closest to 396 + 299 + 196? (a) 1000 (b) 1100 (c) 900 (d) 800
  23. 23.Which is closest to 196 + 195 + 204? (a) 500 (b) 800 (c) 700 (d) 600
  24. 24.Round 41909 to the nearest hundred.
  25. 25.Which is closest to 200 + 898 + 195? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  26. 26.Which is closest to 303 × 39? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  27. 27.Round 52201 to the nearest ten.
  28. 28.Which is closest to 598 + 697 + 397? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  29. 29.Which is closest to 1802 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  30. 30.Which is closest to 598 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  31. 31.Round 55549 to the nearest ten.
  32. 32.Which is closest to 2394 ÷ 29? (a) 160 (b) 40 (c) 80 (d) 800
  33. 33.Which is closest to 991 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  34. 34.Which is closest to 895 + 300 + 295? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  35. 35.Round 86608 to the nearest thousand.
  36. 36.Which is closest to 1795 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  37. 37.Round 21208 to the nearest ten.
  38. 38.Which is closest to 1595 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  39. 39.Round 39.68 to one decimal place. =
  40. 40.Round 29.64 to one decimal place. =

Answer key

  1. 4000
  2. 24000
  3. 8000
  4. 20000
  5. 1800
  6. 32000
  7. 65000
  8. 1600
  9. 27.8
  10. 24000
  11. 40
  12. 46990
  13. 10000
  14. 28.2
  15. 2000
  16. 1100
  17. 1400
  18. 71000
  19. 90.4
  20. 16000
  21. 36.9
  22. 900
  23. 600
  24. 41900
  25. 1300
  26. 12000
  27. 52200
  28. 1700
  29. 90
  30. 20
  31. 55550
  32. 80
  33. 50
  34. 1500
  35. 87000
  36. 60
  37. 21210
  38. 80
  39. 39.7
  40. 29.6

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