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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 59 · 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 65.27 to one decimal place. =
  2. 2.Which is closest to 600 × 51? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  3. 3.Which is closest to 704 × 18? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  4. 4.Which is closest to 397 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  5. 5.Round 25884 to the nearest hundred.
  6. 6.Which is closest to 798 × 58? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  7. 7.Which is closest to 897 × 88? (Round each number first.) (a) 8100 (b) 810000 (c) 162000 (d) 81000
  8. 8.Which is closest to 98 + 105 + 599? (a) 700 (b) 900 (c) 1000 (d) 800
  9. 9.Round 29.22 to one decimal place. =
  10. 10.Which is closest to 2407 ÷ 31? (a) 40 (b) 160 (c) 80 (d) 800
  11. 11.Round 59.72 to one decimal place. =
  12. 12.Which is closest to 1202 ÷ 39? (a) 30 (b) 15 (c) 300 (d) 60
  13. 13.Which is closest to 807 ÷ 41? (a) 10 (b) 200 (c) 20 (d) 40
  14. 14.Which is closest to 902 + 795 + 603? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  15. 15.Round 89487 to the nearest hundred.
  16. 16.Which is closest to 196 + 101 + 305? (a) 800 (b) 500 (c) 700 (d) 600
  17. 17.Which is closest to 901 × 72? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  18. 18.Which is closest to 201 × 40? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  19. 19.Round 73.12 to one decimal place. =
  20. 20.Round 52.51 to one decimal place. =
  21. 21.Which is closest to 902 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  22. 22.Which is closest to 992 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  23. 23.Which is closest to 1999 ÷ 51? (a) 20 (b) 40 (c) 400 (d) 80
  24. 24.Round 18.77 to one decimal place. =
  25. 25.Which is closest to 797 × 62? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  26. 26.Round 13.37 to one decimal place. =
  27. 27.Which is closest to 2707 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  28. 28.Round 73291 to the nearest ten.
  29. 29.Which is closest to 1195 ÷ 21? (a) 600 (b) 30 (c) 60 (d) 120
  30. 30.Round 26.92 to one decimal place. =
  31. 31.Round 73.53 to one decimal place. =
  32. 32.Which is closest to 606 ÷ 31? (a) 20 (b) 40 (c) 200 (d) 10
  33. 33.Round 42563 to the nearest ten.
  34. 34.Round 22.51 to one decimal place. =
  35. 35.Round 50.24 to one decimal place. =
  36. 36.Which is closest to 897 × 82? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  37. 37.Round 13.13 to one decimal place. =
  38. 38.Round 55476 to the nearest thousand.
  39. 39.Round 28392 to the nearest ten.
  40. 40.Round 5478 to the nearest ten.

Answer key

  1. 65.3
  2. 30000
  3. 14000
  4. 16000
  5. 25900
  6. 48000
  7. 81000
  8. 800
  9. 29.2
  10. 80
  11. 59.7
  12. 30
  13. 20
  14. 2300
  15. 89500
  16. 600
  17. 63000
  18. 8000
  19. 73.1
  20. 52.5
  21. 30
  22. 20
  23. 40
  24. 18.8
  25. 48000
  26. 13.4
  27. 90
  28. 73290
  29. 60
  30. 26.9
  31. 73.5
  32. 20
  33. 42560
  34. 22.5
  35. 50.2
  36. 72000
  37. 13.1
  38. 55000
  39. 28390
  40. 5480

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