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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 16 · 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. 1.57 + 29 =
  2. 2.102 + 69 =
  3. 3.120 + 38 =
  4. 4.31 + 48 =
  5. 5.389 + 99 =
  6. 6.343 + 69 =
  7. 7.79 + 29 =
  8. 8.369 + 98 =
  9. 9.32 + 47 =
  10. 10.453 + 87 =
  11. 11.111 + 88 =
  12. 12.152 + 29 =
  13. 13.36 + 87 =
  14. 14.416 + 77 =
  15. 15.211 + 18 =
  16. 16.305 + 98 =
  17. 17.90 + 39 =
  18. 18.458 + 27 =
  19. 19.255 + 39 =
  20. 20.354 + 17 =
  21. 21.58 + 87 =
  22. 22.77 + 28 =
  23. 23.300 + 89 =
  24. 24.312 + 37 =
  25. 25.81 + 27 =
  26. 26.218 + 79 =
  27. 27.265 + 17 =
  28. 28.64 + 69 =
  29. 29.38 + 38 =
  30. 30.286 + 97 =
  31. 31.392 + 69 =
  32. 32.379 + 97 =
  33. 33.356 + 79 =
  34. 34.399 + 57 =
  35. 35.498 + 28 =
  36. 36.179 + 27 =
  37. 37.216 + 39 =
  38. 38.403 + 49 =
  39. 39.88 + 69 =
  40. 40.68 + 39 =

Answer key

  1. 86
  2. 171
  3. 158
  4. 79
  5. 488
  6. 412
  7. 108
  8. 467
  9. 79
  10. 540
  11. 199
  12. 181
  13. 123
  14. 493
  15. 229
  16. 403
  17. 129
  18. 485
  19. 294
  20. 371
  21. 145
  22. 105
  23. 389
  24. 349
  25. 108
  26. 297
  27. 282
  28. 133
  29. 76
  30. 383
  31. 461
  32. 476
  33. 435
  34. 456
  35. 526
  36. 206
  37. 255
  38. 452
  39. 157
  40. 107

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