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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 823 · 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. 1.365 + 69 =
  2. 2.239 + 57 =
  3. 3.460 + 99 =
  4. 4.245 + 49 =
  5. 5.75 + 49 =
  6. 6.295 + 78 =
  7. 7.268 + 29 =
  8. 8.103 + 29 =
  9. 9.116 + 57 =
  10. 10.465 + 58 =
  11. 11.149 + 67 =
  12. 12.87 + 29 =
  13. 13.172 + 29 =
  14. 14.312 + 97 =
  15. 15.175 + 77 =
  16. 16.468 + 59 =
  17. 17.410 + 67 =
  18. 18.253 + 37 =
  19. 19.365 + 89 =
  20. 20.46 + 27 =
  21. 21.307 + 87 =
  22. 22.224 + 57 =
  23. 23.371 + 89 =
  24. 24.388 + 67 =
  25. 25.123 + 39 =
  26. 26.111 + 87 =
  27. 27.485 + 37 =
  28. 28.196 + 68 =
  29. 29.470 + 69 =
  30. 30.70 + 47 =
  31. 31.48 + 37 =
  32. 32.196 + 79 =
  33. 33.205 + 17 =
  34. 34.160 + 28 =
  35. 35.352 + 19 =
  36. 36.248 + 37 =
  37. 37.130 + 88 =
  38. 38.403 + 89 =
  39. 39.172 + 79 =
  40. 40.50 + 67 =

Answer key

  1. 434
  2. 296
  3. 559
  4. 294
  5. 124
  6. 373
  7. 297
  8. 132
  9. 173
  10. 523
  11. 216
  12. 116
  13. 201
  14. 409
  15. 252
  16. 527
  17. 477
  18. 290
  19. 454
  20. 73
  21. 394
  22. 281
  23. 460
  24. 455
  25. 162
  26. 198
  27. 522
  28. 264
  29. 539
  30. 117
  31. 85
  32. 275
  33. 222
  34. 188
  35. 371
  36. 285
  37. 218
  38. 492
  39. 251
  40. 117

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