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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 326 · 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. 1.449 + 29 =
  2. 2.426 + 99 =
  3. 3.329 + 97 =
  4. 4.458 + 49 =
  5. 5.480 + 67 =
  6. 6.221 + 99 =
  7. 7.224 + 99 =
  8. 8.136 + 49 =
  9. 9.239 + 88 =
  10. 10.230 + 87 =
  11. 11.319 + 87 =
  12. 12.333 + 67 =
  13. 13.268 + 87 =
  14. 14.478 + 29 =
  15. 15.86 + 68 =
  16. 16.387 + 69 =
  17. 17.92 + 49 =
  18. 18.455 + 88 =
  19. 19.199 + 18 =
  20. 20.172 + 19 =
  21. 21.298 + 17 =
  22. 22.374 + 17 =
  23. 23.111 + 47 =
  24. 24.321 + 39 =
  25. 25.93 + 67 =
  26. 26.242 + 57 =
  27. 27.221 + 47 =
  28. 28.289 + 48 =
  29. 29.427 + 19 =
  30. 30.199 + 67 =
  31. 31.318 + 77 =
  32. 32.252 + 38 =
  33. 33.399 + 38 =
  34. 34.374 + 37 =
  35. 35.154 + 49 =
  36. 36.105 + 27 =
  37. 37.499 + 37 =
  38. 38.256 + 47 =
  39. 39.205 + 19 =
  40. 40.222 + 37 =

Answer key

  1. 478
  2. 525
  3. 426
  4. 507
  5. 547
  6. 320
  7. 323
  8. 185
  9. 327
  10. 317
  11. 406
  12. 400
  13. 355
  14. 507
  15. 154
  16. 456
  17. 141
  18. 543
  19. 217
  20. 191
  21. 315
  22. 391
  23. 158
  24. 360
  25. 160
  26. 299
  27. 268
  28. 337
  29. 446
  30. 266
  31. 395
  32. 290
  33. 437
  34. 411
  35. 203
  36. 132
  37. 536
  38. 303
  39. 224
  40. 259

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