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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 193 · 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. 1.52 + 37 =
  2. 2.28 + 28 =
  3. 3.345 + 17 =
  4. 4.451 + 17 =
  5. 5.486 + 18 =
  6. 6.70 + 59 =
  7. 7.349 + 59 =
  8. 8.129 + 69 =
  9. 9.49 + 19 =
  10. 10.367 + 98 =
  11. 11.432 + 98 =
  12. 12.246 + 28 =
  13. 13.40 + 28 =
  14. 14.481 + 77 =
  15. 15.291 + 28 =
  16. 16.373 + 49 =
  17. 17.153 + 27 =
  18. 18.217 + 79 =
  19. 19.337 + 99 =
  20. 20.359 + 99 =
  21. 21.72 + 59 =
  22. 22.477 + 17 =
  23. 23.208 + 37 =
  24. 24.344 + 57 =
  25. 25.203 + 67 =
  26. 26.121 + 87 =
  27. 27.356 + 39 =
  28. 28.402 + 97 =
  29. 29.134 + 28 =
  30. 30.131 + 29 =
  31. 31.103 + 57 =
  32. 32.126 + 97 =
  33. 33.404 + 97 =
  34. 34.392 + 59 =
  35. 35.221 + 59 =
  36. 36.363 + 77 =
  37. 37.176 + 78 =
  38. 38.57 + 27 =
  39. 39.224 + 47 =
  40. 40.231 + 37 =

Answer key

  1. 89
  2. 56
  3. 362
  4. 468
  5. 504
  6. 129
  7. 408
  8. 198
  9. 68
  10. 465
  11. 530
  12. 274
  13. 68
  14. 558
  15. 319
  16. 422
  17. 180
  18. 296
  19. 436
  20. 458
  21. 131
  22. 494
  23. 245
  24. 401
  25. 270
  26. 208
  27. 395
  28. 499
  29. 162
  30. 160
  31. 160
  32. 223
  33. 501
  34. 451
  35. 280
  36. 440
  37. 254
  38. 84
  39. 271
  40. 268

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