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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 992 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.123 + 37 =
  2. 2.437 + 78 =
  3. 3.311 + 29 =
  4. 4.60 + 48 =
  5. 5.322 + 28 =
  6. 6.452 + 37 =
  7. 7.264 + 79 =
  8. 8.41 + 58 =
  9. 9.417 + 99 =
  10. 10.155 + 47 =
  11. 11.86 + 29 =
  12. 12.279 + 18 =
  13. 13.181 + 68 =
  14. 14.308 + 69 =
  15. 15.83 + 49 =
  16. 16.459 + 57 =
  17. 17.219 + 99 =
  18. 18.50 + 59 =
  19. 19.474 + 19 =
  20. 20.426 + 77 =
  21. 21.109 + 18 =
  22. 22.244 + 77 =
  23. 23.85 + 99 =
  24. 24.439 + 98 =
  25. 25.484 + 98 =
  26. 26.313 + 38 =
  27. 27.112 + 47 =
  28. 28.392 + 37 =
  29. 29.460 + 87 =
  30. 30.43 + 58 =
  31. 31.344 + 28 =
  32. 32.102 + 98 =
  33. 33.282 + 29 =
  34. 34.419 + 59 =
  35. 35.225 + 69 =
  36. 36.113 + 49 =
  37. 37.47 + 79 =
  38. 38.262 + 37 =
  39. 39.52 + 57 =
  40. 40.471 + 78 =

Answer key

  1. 160
  2. 515
  3. 340
  4. 108
  5. 350
  6. 489
  7. 343
  8. 99
  9. 516
  10. 202
  11. 115
  12. 297
  13. 249
  14. 377
  15. 132
  16. 516
  17. 318
  18. 109
  19. 493
  20. 503
  21. 127
  22. 321
  23. 184
  24. 537
  25. 582
  26. 351
  27. 159
  28. 429
  29. 547
  30. 101
  31. 372
  32. 200
  33. 311
  34. 478
  35. 294
  36. 162
  37. 126
  38. 299
  39. 109
  40. 549

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