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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 808 · 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 768 + 696? (a) 1500 (b) 1700 (c) 1300
  2. 2.Best estimate of 287 + 264? (a) 800 (b) 600 (c) 400
  3. 3.Best estimate of 86 × 48? (a) 4500 (b) 450 (c) 45000
  4. 4.Best estimate of 79 × 13? (a) 80 (b) 800 (c) 8000
  5. 5.Best estimate of 70 × 37? (a) 28000 (b) 280 (c) 2800
  6. 6.Best estimate of 26 × 44? (a) 12000 (b) 1200 (c) 120
  7. 7.Best estimate of 563 + 703? (a) 1100 (b) 1300 (c) 1500
  8. 8.Best estimate of 46 × 49? (a) 250 (b) 25000 (c) 2500
  9. 9.Best estimate of 448 + 840? (a) 1000 (b) 1400 (c) 1200
  10. 10.Best estimate of 68 × 86? (a) 630 (b) 63000 (c) 6300
  11. 11.Best estimate of 870 + 662? (a) 1800 (b) 1600 (c) 1400
  12. 12.Best estimate of 880 + 596? (a) 1700 (b) 1300 (c) 1500
  13. 13.Best estimate of 49 × 61? (a) 3000 (b) 30000 (c) 300
  14. 14.Best estimate of 851 + 358? (a) 1500 (b) 1300 (c) 1100
  15. 15.Best estimate of 37 × 79? (a) 3200 (b) 32000 (c) 320
  16. 16.Best estimate of 703 + 286? (a) 800 (b) 1000 (c) 1200
  17. 17.Best estimate of 731 + 735? (a) 1600 (b) 1400 (c) 1200
  18. 18.Best estimate of 296 + 442? (a) 900 (b) 700 (c) 500
  19. 19.Best estimate of 16 × 39? (a) 8000 (b) 800 (c) 80
  20. 20.Best estimate of 253 + 762? (a) 1100 (b) 900 (c) 1300
  21. 21.Best estimate of 135 + 211? (a) 300 (b) 500 (c) 100
  22. 22.Best estimate of 611 + 786? (a) 1600 (b) 1200 (c) 1400
  23. 23.Best estimate of 40 × 23? (a) 80 (b) 800 (c) 8000
  24. 24.Best estimate of 54 × 50? (a) 25000 (b) 2500 (c) 250
  25. 25.Best estimate of 32 × 37? (a) 12000 (b) 120 (c) 1200
  26. 26.Best estimate of 62 × 77? (a) 4800 (b) 480 (c) 48000
  27. 27.Best estimate of 66 × 54? (a) 3500 (b) 35000 (c) 350
  28. 28.Best estimate of 653 + 298? (a) 1200 (b) 800 (c) 1000
  29. 29.Best estimate of 27 × 56? (a) 18000 (b) 180 (c) 1800
  30. 30.Best estimate of 756 + 472? (a) 1100 (b) 1500 (c) 1300
  31. 31.Best estimate of 693 + 619? (a) 1500 (b) 1100 (c) 1300
  32. 32.Best estimate of 405 + 201? (a) 600 (b) 400 (c) 800
  33. 33.Best estimate of 76 × 19? (a) 1600 (b) 16000 (c) 160
  34. 34.Best estimate of 454 + 525? (a) 1000 (b) 1200 (c) 800
  35. 35.Best estimate of 14 × 81? (a) 800 (b) 80 (c) 8000
  36. 36.Best estimate of 17 × 64? (a) 1200 (b) 120 (c) 12000
  37. 37.Best estimate of 842 + 697? (a) 1500 (b) 1700 (c) 1300
  38. 38.Best estimate of 43 × 20? (a) 80 (b) 8000 (c) 800
  39. 39.Best estimate of 14 × 54? (a) 5000 (b) 50 (c) 500
  40. 40.Best estimate of 385 + 818? (a) 1400 (b) 1200 (c) 1000

Answer key

  1. 1500
  2. 600
  3. 4500
  4. 800
  5. 2800
  6. 1200
  7. 1300
  8. 2500
  9. 1200
  10. 6300
  11. 1600
  12. 1500
  13. 3000
  14. 1300
  15. 3200
  16. 1000
  17. 1400
  18. 700
  19. 800
  20. 1100
  21. 300
  22. 1400
  23. 800
  24. 2500
  25. 1200
  26. 4800
  27. 3500
  28. 1000
  29. 1800
  30. 1300
  31. 1300
  32. 600
  33. 1600
  34. 1000
  35. 800
  36. 1200
  37. 1500
  38. 800
  39. 500
  40. 1200

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