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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 144 · 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. 1.212 + 97 =
  2. 2.81 + 98 =
  3. 3.127 + 98 =
  4. 4.192 + 59 =
  5. 5.186 + 38 =
  6. 6.182 + 79 =
  7. 7.303 + 47 =
  8. 8.232 + 37 =
  9. 9.119 + 78 =
  10. 10.433 + 38 =
  11. 11.44 + 99 =
  12. 12.130 + 69 =
  13. 13.72 + 17 =
  14. 14.175 + 68 =
  15. 15.272 + 27 =
  16. 16.57 + 88 =
  17. 17.417 + 47 =
  18. 18.27 + 57 =
  19. 19.471 + 27 =
  20. 20.272 + 89 =
  21. 21.423 + 77 =
  22. 22.35 + 99 =
  23. 23.357 + 48 =
  24. 24.405 + 58 =
  25. 25.427 + 28 =
  26. 26.374 + 79 =
  27. 27.485 + 97 =
  28. 28.492 + 99 =
  29. 29.442 + 48 =
  30. 30.230 + 69 =
  31. 31.68 + 97 =
  32. 32.119 + 28 =
  33. 33.298 + 97 =
  34. 34.197 + 38 =
  35. 35.130 + 79 =
  36. 36.36 + 58 =
  37. 37.159 + 47 =
  38. 38.469 + 19 =
  39. 39.300 + 87 =
  40. 40.242 + 97 =

Answer key

  1. 309
  2. 179
  3. 225
  4. 251
  5. 224
  6. 261
  7. 350
  8. 269
  9. 197
  10. 471
  11. 143
  12. 199
  13. 89
  14. 243
  15. 299
  16. 145
  17. 464
  18. 84
  19. 498
  20. 361
  21. 500
  22. 134
  23. 405
  24. 463
  25. 455
  26. 453
  27. 582
  28. 591
  29. 490
  30. 299
  31. 165
  32. 147
  33. 395
  34. 235
  35. 209
  36. 94
  37. 206
  38. 488
  39. 387
  40. 339

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