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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 708 · 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. 1.38 + 67 =
  2. 2.361 + 77 =
  3. 3.479 + 89 =
  4. 4.325 + 47 =
  5. 5.463 + 27 =
  6. 6.343 + 38 =
  7. 7.98 + 17 =
  8. 8.380 + 87 =
  9. 9.45 + 47 =
  10. 10.421 + 19 =
  11. 11.342 + 98 =
  12. 12.116 + 17 =
  13. 13.416 + 89 =
  14. 14.265 + 18 =
  15. 15.432 + 59 =
  16. 16.438 + 77 =
  17. 17.171 + 69 =
  18. 18.122 + 57 =
  19. 19.424 + 59 =
  20. 20.286 + 97 =
  21. 21.127 + 48 =
  22. 22.398 + 87 =
  23. 23.25 + 38 =
  24. 24.117 + 79 =
  25. 25.139 + 79 =
  26. 26.196 + 69 =
  27. 27.464 + 69 =
  28. 28.362 + 49 =
  29. 29.369 + 97 =
  30. 30.146 + 27 =
  31. 31.349 + 77 =
  32. 32.486 + 89 =
  33. 33.333 + 87 =
  34. 34.93 + 27 =
  35. 35.405 + 58 =
  36. 36.482 + 38 =
  37. 37.356 + 57 =
  38. 38.303 + 99 =
  39. 39.144 + 59 =
  40. 40.154 + 48 =

Answer key

  1. 105
  2. 438
  3. 568
  4. 372
  5. 490
  6. 381
  7. 115
  8. 467
  9. 92
  10. 440
  11. 440
  12. 133
  13. 505
  14. 283
  15. 491
  16. 515
  17. 240
  18. 179
  19. 483
  20. 383
  21. 175
  22. 485
  23. 63
  24. 196
  25. 218
  26. 265
  27. 533
  28. 411
  29. 466
  30. 173
  31. 426
  32. 575
  33. 420
  34. 120
  35. 463
  36. 520
  37. 413
  38. 402
  39. 203
  40. 202

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