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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 261 · 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. 1.116 + 97 =
  2. 2.45 + 38 =
  3. 3.29 + 87 =
  4. 4.404 + 99 =
  5. 5.469 + 29 =
  6. 6.472 + 58 =
  7. 7.445 + 78 =
  8. 8.173 + 49 =
  9. 9.44 + 39 =
  10. 10.443 + 88 =
  11. 11.175 + 77 =
  12. 12.148 + 59 =
  13. 13.32 + 59 =
  14. 14.340 + 79 =
  15. 15.347 + 99 =
  16. 16.62 + 68 =
  17. 17.392 + 78 =
  18. 18.62 + 19 =
  19. 19.454 + 29 =
  20. 20.91 + 18 =
  21. 21.245 + 29 =
  22. 22.360 + 17 =
  23. 23.155 + 47 =
  24. 24.388 + 38 =
  25. 25.216 + 67 =
  26. 26.126 + 57 =
  27. 27.442 + 37 =
  28. 28.441 + 67 =
  29. 29.413 + 79 =
  30. 30.100 + 29 =
  31. 31.438 + 48 =
  32. 32.199 + 17 =
  33. 33.70 + 78 =
  34. 34.471 + 38 =
  35. 35.353 + 79 =
  36. 36.498 + 89 =
  37. 37.130 + 38 =
  38. 38.371 + 99 =
  39. 39.369 + 17 =
  40. 40.257 + 77 =

Answer key

  1. 213
  2. 83
  3. 116
  4. 503
  5. 498
  6. 530
  7. 523
  8. 222
  9. 83
  10. 531
  11. 252
  12. 207
  13. 91
  14. 419
  15. 446
  16. 130
  17. 470
  18. 81
  19. 483
  20. 109
  21. 274
  22. 377
  23. 202
  24. 426
  25. 283
  26. 183
  27. 479
  28. 508
  29. 492
  30. 129
  31. 486
  32. 216
  33. 148
  34. 509
  35. 432
  36. 587
  37. 168
  38. 470
  39. 386
  40. 334

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