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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 464 · 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 397 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  2. 2.Which is closest to 3199 ÷ 41? (a) 160 (b) 40 (c) 800 (d) 80
  3. 3.Which is closest to 401 × 19? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  4. 4.Round 53354 to the nearest thousand.
  5. 5.Round 58702 to the nearest thousand.
  6. 6.Which is closest to 401 × 38? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  7. 7.Which is closest to 1493 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  8. 8.Which is closest to 896 × 19? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  9. 9.Round 89536 to the nearest thousand.
  10. 10.Which is closest to 697 × 39? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  11. 11.Round 51.67 to one decimal place. =
  12. 12.Which is closest to 302 × 62? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  13. 13.Which is closest to 1393 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140
  14. 14.Which is closest to 697 + 205 + 97? (a) 1200 (b) 1000 (c) 1100 (d) 900
  15. 15.Round 26.12 to one decimal place. =
  16. 16.Round 42018 to the nearest hundred.
  17. 17.Which is closest to 1592 ÷ 41? (a) 40 (b) 80 (c) 400 (d) 20
  18. 18.Which is closest to 104 + 298 + 600? (a) 900 (b) 1100 (c) 1200 (d) 1000
  19. 19.Which is closest to 804 + 498 + 299? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  20. 20.Round 48692 to the nearest ten.
  21. 21.Which is closest to 604 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  22. 22.Round 91.57 to one decimal place. =
  23. 23.Which is closest to 700 + 295 + 598? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  24. 24.Which is closest to 196 + 603 + 395? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  25. 25.Round 53.83 to one decimal place. =
  26. 26.Round 50770 to the nearest hundred.
  27. 27.Round 74.86 to one decimal place. =
  28. 28.Which is closest to 798 × 68? (Round each number first.) (a) 56000 (b) 5600 (c) 560000 (d) 112000
  29. 29.Round 38631 to the nearest hundred.
  30. 30.Round 35539 to the nearest hundred.
  31. 31.Which is closest to 2404 ÷ 29? (a) 800 (b) 80 (c) 40 (d) 160
  32. 32.Round 87517 to the nearest ten.
  33. 33.Which is closest to 201 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  34. 34.Which is closest to 102 + 398 + 302? (a) 700 (b) 900 (c) 1000 (d) 800
  35. 35.Round 6072 to the nearest ten.
  36. 36.Round 11.74 to one decimal place. =
  37. 37.Which is closest to 801 + 202 + 197? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  38. 38.Round 56.52 to one decimal place. =
  39. 39.Round 64.21 to one decimal place. =
  40. 40.Round 7583 to the nearest thousand.

Answer key

  1. 12000
  2. 80
  3. 8000
  4. 53000
  5. 59000
  6. 16000
  7. 30
  8. 18000
  9. 90000
  10. 28000
  11. 51.7
  12. 18000
  13. 70
  14. 1000
  15. 26.1
  16. 42000
  17. 40
  18. 1000
  19. 1600
  20. 48690
  21. 20
  22. 91.6
  23. 1600
  24. 1200
  25. 53.8
  26. 50800
  27. 74.9
  28. 56000
  29. 38600
  30. 35500
  31. 80
  32. 87520
  33. 12000
  34. 800
  35. 6070
  36. 11.7
  37. 1200
  38. 56.5
  39. 64.2
  40. 8000

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