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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 174 · 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. 1.49 + 59 =
  2. 2.181 + 48 =
  3. 3.145 + 68 =
  4. 4.431 + 58 =
  5. 5.281 + 68 =
  6. 6.89 + 58 =
  7. 7.66 + 28 =
  8. 8.220 + 49 =
  9. 9.412 + 97 =
  10. 10.110 + 17 =
  11. 11.316 + 17 =
  12. 12.277 + 47 =
  13. 13.337 + 29 =
  14. 14.162 + 57 =
  15. 15.293 + 68 =
  16. 16.362 + 47 =
  17. 17.356 + 29 =
  18. 18.158 + 47 =
  19. 19.497 + 98 =
  20. 20.351 + 37 =
  21. 21.84 + 49 =
  22. 22.411 + 17 =
  23. 23.58 + 28 =
  24. 24.95 + 27 =
  25. 25.64 + 27 =
  26. 26.79 + 98 =
  27. 27.204 + 39 =
  28. 28.257 + 39 =
  29. 29.497 + 47 =
  30. 30.450 + 68 =
  31. 31.142 + 29 =
  32. 32.228 + 19 =
  33. 33.482 + 67 =
  34. 34.398 + 18 =
  35. 35.67 + 18 =
  36. 36.25 + 39 =
  37. 37.285 + 39 =
  38. 38.140 + 59 =
  39. 39.450 + 48 =
  40. 40.196 + 29 =

Answer key

  1. 108
  2. 229
  3. 213
  4. 489
  5. 349
  6. 147
  7. 94
  8. 269
  9. 509
  10. 127
  11. 333
  12. 324
  13. 366
  14. 219
  15. 361
  16. 409
  17. 385
  18. 205
  19. 595
  20. 388
  21. 133
  22. 428
  23. 86
  24. 122
  25. 91
  26. 177
  27. 243
  28. 296
  29. 544
  30. 518
  31. 171
  32. 247
  33. 549
  34. 416
  35. 85
  36. 64
  37. 324
  38. 199
  39. 498
  40. 225

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