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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 647 · 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. 1.105 + 27 =
  2. 2.208 + 67 =
  3. 3.437 + 47 =
  4. 4.287 + 78 =
  5. 5.143 + 59 =
  6. 6.342 + 99 =
  7. 7.314 + 69 =
  8. 8.366 + 37 =
  9. 9.353 + 38 =
  10. 10.406 + 37 =
  11. 11.127 + 47 =
  12. 12.153 + 77 =
  13. 13.432 + 18 =
  14. 14.146 + 28 =
  15. 15.121 + 47 =
  16. 16.234 + 28 =
  17. 17.259 + 27 =
  18. 18.323 + 79 =
  19. 19.385 + 47 =
  20. 20.231 + 17 =
  21. 21.266 + 58 =
  22. 22.260 + 59 =
  23. 23.129 + 57 =
  24. 24.277 + 17 =
  25. 25.99 + 37 =
  26. 26.150 + 58 =
  27. 27.108 + 67 =
  28. 28.182 + 88 =
  29. 29.88 + 49 =
  30. 30.252 + 38 =
  31. 31.334 + 37 =
  32. 32.455 + 59 =
  33. 33.136 + 37 =
  34. 34.342 + 49 =
  35. 35.405 + 47 =
  36. 36.295 + 48 =
  37. 37.313 + 49 =
  38. 38.183 + 79 =
  39. 39.382 + 68 =
  40. 40.189 + 77 =

Answer key

  1. 132
  2. 275
  3. 484
  4. 365
  5. 202
  6. 441
  7. 383
  8. 403
  9. 391
  10. 443
  11. 174
  12. 230
  13. 450
  14. 174
  15. 168
  16. 262
  17. 286
  18. 402
  19. 432
  20. 248
  21. 324
  22. 319
  23. 186
  24. 294
  25. 136
  26. 208
  27. 175
  28. 270
  29. 137
  30. 290
  31. 371
  32. 514
  33. 173
  34. 391
  35. 452
  36. 343
  37. 362
  38. 262
  39. 450
  40. 266

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