← Rounding off and best estimate lesson New set →

Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 444 · 40 questions
TalentJR

How to do it in your head (Round, then work): Round each number: 2-digit numbers to the nearest ten, 3-digit numbers to the nearest hundred. Do the easy sum with the round numbers. Choose the option closest to your estimate.

NameDateTime takenScore ___ / 40
  1. 1.Best estimate of 808 + 379? (a) 1400 (b) 1200 (c) 1000
  2. 2.Best estimate of 96 × 97? (a) 100000 (b) 1000 (c) 10000
  3. 3.Best estimate of 96 × 94? (a) 90000 (b) 9000 (c) 900
  4. 4.Best estimate of 513 + 876? (a) 1200 (b) 1400 (c) 1600
  5. 5.Best estimate of 461 + 738? (a) 1000 (b) 1200 (c) 1400
  6. 6.Best estimate of 93 × 36? (a) 36000 (b) 3600 (c) 360
  7. 7.Best estimate of 682 + 375? (a) 1300 (b) 900 (c) 1100
  8. 8.Best estimate of 66 × 78? (a) 5600 (b) 560 (c) 56000
  9. 9.Best estimate of 78 × 96? (a) 800 (b) 8000 (c) 80000
  10. 10.Best estimate of 84 × 58? (a) 48000 (b) 4800 (c) 480
  11. 11.Best estimate of 21 × 69? (a) 140 (b) 14000 (c) 1400
  12. 12.Best estimate of 97 × 63? (a) 600 (b) 6000 (c) 60000
  13. 13.Best estimate of 226 + 229? (a) 600 (b) 200 (c) 400
  14. 14.Best estimate of 543 + 546? (a) 1000 (b) 800 (c) 1200
  15. 15.Best estimate of 48 × 69? (a) 35000 (b) 3500 (c) 350
  16. 16.Best estimate of 27 × 40? (a) 120 (b) 12000 (c) 1200
  17. 17.Best estimate of 371 + 481? (a) 700 (b) 900 (c) 1100
  18. 18.Best estimate of 383 + 776? (a) 1400 (b) 1200 (c) 1000
  19. 19.Best estimate of 355 + 657? (a) 1100 (b) 900 (c) 1300
  20. 20.Best estimate of 22 × 46? (a) 100 (b) 1000 (c) 10000
  21. 21.Best estimate of 195 + 697? (a) 700 (b) 900 (c) 1100
  22. 22.Best estimate of 398 + 207? (a) 400 (b) 800 (c) 600
  23. 23.Best estimate of 311 + 860? (a) 1200 (b) 1400 (c) 1000
  24. 24.Best estimate of 84 × 80? (a) 6400 (b) 64000 (c) 640
  25. 25.Best estimate of 179 + 195? (a) 600 (b) 400 (c) 200
  26. 26.Best estimate of 98 × 51? (a) 5000 (b) 500 (c) 50000
  27. 27.Best estimate of 334 + 683? (a) 1000 (b) 1200 (c) 800
  28. 28.Best estimate of 53 × 96? (a) 500 (b) 5000 (c) 50000
  29. 29.Best estimate of 160 + 733? (a) 700 (b) 900 (c) 1100
  30. 30.Best estimate of 495 + 860? (a) 1600 (b) 1400 (c) 1200
  31. 31.Best estimate of 36 × 17? (a) 800 (b) 8000 (c) 80
  32. 32.Best estimate of 324 + 487? (a) 600 (b) 800 (c) 1000
  33. 33.Best estimate of 88 × 16? (a) 1800 (b) 18000 (c) 180
  34. 34.Best estimate of 330 + 335? (a) 600 (b) 800 (c) 400
  35. 35.Best estimate of 221 + 560? (a) 1000 (b) 800 (c) 600
  36. 36.Best estimate of 26 × 22? (a) 60 (b) 6000 (c) 600
  37. 37.Best estimate of 524 + 859? (a) 1400 (b) 1600 (c) 1200
  38. 38.Best estimate of 18 × 19? (a) 400 (b) 4000 (c) 40
  39. 39.Best estimate of 799 + 207? (a) 1000 (b) 800 (c) 1200
  40. 40.Best estimate of 595 + 741? (a) 1100 (b) 1500 (c) 1300

Answer key

  1. 1200
  2. 10000
  3. 9000
  4. 1400
  5. 1200
  6. 3600
  7. 1100
  8. 5600
  9. 8000
  10. 4800
  11. 1400
  12. 6000
  13. 400
  14. 1000
  15. 3500
  16. 1200
  17. 900
  18. 1200
  19. 1100
  20. 1000
  21. 900
  22. 600
  23. 1200
  24. 6400
  25. 400
  26. 5000
  27. 1000
  28. 5000
  29. 900
  30. 1400
  31. 800
  32. 800
  33. 1800
  34. 600
  35. 800
  36. 600
  37. 1400
  38. 400
  39. 1000
  40. 1300

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths