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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 484 · 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. 1.396 + 19 =
  2. 2.62 + 27 =
  3. 3.36 + 87 =
  4. 4.437 + 27 =
  5. 5.234 + 99 =
  6. 6.238 + 69 =
  7. 7.192 + 28 =
  8. 8.35 + 89 =
  9. 9.118 + 27 =
  10. 10.141 + 49 =
  11. 11.318 + 18 =
  12. 12.129 + 27 =
  13. 13.294 + 99 =
  14. 14.448 + 78 =
  15. 15.126 + 67 =
  16. 16.464 + 87 =
  17. 17.253 + 29 =
  18. 18.78 + 58 =
  19. 19.337 + 78 =
  20. 20.191 + 29 =
  21. 21.232 + 29 =
  22. 22.117 + 49 =
  23. 23.168 + 98 =
  24. 24.144 + 98 =
  25. 25.192 + 88 =
  26. 26.208 + 47 =
  27. 27.66 + 19 =
  28. 28.271 + 18 =
  29. 29.272 + 28 =
  30. 30.354 + 97 =
  31. 31.62 + 18 =
  32. 32.47 + 97 =
  33. 33.442 + 57 =
  34. 34.344 + 27 =
  35. 35.314 + 98 =
  36. 36.426 + 99 =
  37. 37.256 + 99 =
  38. 38.38 + 38 =
  39. 39.265 + 19 =
  40. 40.128 + 48 =

Answer key

  1. 415
  2. 89
  3. 123
  4. 464
  5. 333
  6. 307
  7. 220
  8. 124
  9. 145
  10. 190
  11. 336
  12. 156
  13. 393
  14. 526
  15. 193
  16. 551
  17. 282
  18. 136
  19. 415
  20. 220
  21. 261
  22. 166
  23. 266
  24. 242
  25. 280
  26. 255
  27. 85
  28. 289
  29. 300
  30. 451
  31. 80
  32. 144
  33. 499
  34. 371
  35. 412
  36. 525
  37. 355
  38. 76
  39. 284
  40. 176

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