← Rounding off and best estimate lesson New set →

Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 968 · 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 854 + 328? (a) 1000 (b) 1200 (c) 1400
  2. 2.Best estimate of 217 + 595? (a) 800 (b) 600 (c) 1000
  3. 3.Best estimate of 535 + 609? (a) 900 (b) 1100 (c) 1300
  4. 4.Best estimate of 185 + 718? (a) 900 (b) 1100 (c) 700
  5. 5.Best estimate of 656 + 310? (a) 800 (b) 1000 (c) 1200
  6. 6.Best estimate of 89 × 46? (a) 4500 (b) 45000 (c) 450
  7. 7.Best estimate of 195 + 482? (a) 700 (b) 500 (c) 900
  8. 8.Best estimate of 789 + 498? (a) 1300 (b) 1100 (c) 1500
  9. 9.Best estimate of 506 + 537? (a) 1000 (b) 800 (c) 1200
  10. 10.Best estimate of 180 + 299? (a) 300 (b) 700 (c) 500
  11. 11.Best estimate of 362 + 855? (a) 1300 (b) 1100 (c) 1500
  12. 12.Best estimate of 198 + 313? (a) 300 (b) 500 (c) 700
  13. 13.Best estimate of 253 + 206? (a) 500 (b) 300 (c) 700
  14. 14.Best estimate of 217 + 239? (a) 400 (b) 200 (c) 600
  15. 15.Best estimate of 57 × 58? (a) 36000 (b) 3600 (c) 360
  16. 16.Best estimate of 622 + 469? (a) 900 (b) 1100 (c) 1300
  17. 17.Best estimate of 142 + 276? (a) 600 (b) 200 (c) 400
  18. 18.Best estimate of 46 × 24? (a) 1000 (b) 10000 (c) 100
  19. 19.Best estimate of 76 × 79? (a) 640 (b) 64000 (c) 6400
  20. 20.Best estimate of 248 + 590? (a) 600 (b) 800 (c) 1000
  21. 21.Best estimate of 755 + 781? (a) 1400 (b) 1600 (c) 1800
  22. 22.Best estimate of 21 × 46? (a) 10000 (b) 100 (c) 1000
  23. 23.Best estimate of 238 + 521? (a) 700 (b) 500 (c) 900
  24. 24.Best estimate of 17 × 91? (a) 180 (b) 18000 (c) 1800
  25. 25.Best estimate of 17 × 36? (a) 800 (b) 80 (c) 8000
  26. 26.Best estimate of 373 + 414? (a) 800 (b) 1000 (c) 600
  27. 27.Best estimate of 843 + 162? (a) 1200 (b) 1000 (c) 800
  28. 28.Best estimate of 30 × 37? (a) 12000 (b) 120 (c) 1200
  29. 29.Best estimate of 87 × 82? (a) 72000 (b) 720 (c) 7200
  30. 30.Best estimate of 54 × 26? (a) 1500 (b) 15000 (c) 150
  31. 31.Best estimate of 19 × 28? (a) 6000 (b) 60 (c) 600
  32. 32.Best estimate of 70 × 58? (a) 42000 (b) 4200 (c) 420
  33. 33.Best estimate of 41 × 13? (a) 400 (b) 40 (c) 4000
  34. 34.Best estimate of 27 × 89? (a) 27000 (b) 270 (c) 2700
  35. 35.Best estimate of 19 × 97? (a) 2000 (b) 200 (c) 20000
  36. 36.Best estimate of 42 × 58? (a) 240 (b) 2400 (c) 24000
  37. 37.Best estimate of 736 + 134? (a) 800 (b) 1000 (c) 600
  38. 38.Best estimate of 42 × 13? (a) 40 (b) 4000 (c) 400
  39. 39.Best estimate of 27 × 96? (a) 3000 (b) 30000 (c) 300
  40. 40.Best estimate of 340 + 727? (a) 1200 (b) 1000 (c) 800

Answer key

  1. 1200
  2. 800
  3. 1100
  4. 900
  5. 1000
  6. 4500
  7. 700
  8. 1300
  9. 1000
  10. 500
  11. 1300
  12. 500
  13. 500
  14. 400
  15. 3600
  16. 1100
  17. 400
  18. 1000
  19. 6400
  20. 800
  21. 1600
  22. 1000
  23. 700
  24. 1800
  25. 800
  26. 800
  27. 1000
  28. 1200
  29. 7200
  30. 1500
  31. 600
  32. 4200
  33. 400
  34. 2700
  35. 2000
  36. 2400
  37. 800
  38. 400
  39. 3000
  40. 1000

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