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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 657 · 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. 1.395 + 69 =
  2. 2.180 + 47 =
  3. 3.356 + 98 =
  4. 4.207 + 57 =
  5. 5.380 + 17 =
  6. 6.175 + 77 =
  7. 7.344 + 18 =
  8. 8.142 + 88 =
  9. 9.346 + 27 =
  10. 10.218 + 47 =
  11. 11.490 + 47 =
  12. 12.469 + 78 =
  13. 13.224 + 18 =
  14. 14.128 + 88 =
  15. 15.325 + 39 =
  16. 16.102 + 38 =
  17. 17.360 + 67 =
  18. 18.259 + 18 =
  19. 19.49 + 98 =
  20. 20.355 + 18 =
  21. 21.220 + 87 =
  22. 22.406 + 79 =
  23. 23.91 + 27 =
  24. 24.463 + 29 =
  25. 25.213 + 57 =
  26. 26.410 + 29 =
  27. 27.62 + 27 =
  28. 28.333 + 48 =
  29. 29.403 + 97 =
  30. 30.208 + 87 =
  31. 31.351 + 88 =
  32. 32.215 + 39 =
  33. 33.112 + 98 =
  34. 34.113 + 49 =
  35. 35.184 + 68 =
  36. 36.152 + 89 =
  37. 37.412 + 77 =
  38. 38.380 + 57 =
  39. 39.195 + 37 =
  40. 40.453 + 37 =

Answer key

  1. 464
  2. 227
  3. 454
  4. 264
  5. 397
  6. 252
  7. 362
  8. 230
  9. 373
  10. 265
  11. 537
  12. 547
  13. 242
  14. 216
  15. 364
  16. 140
  17. 427
  18. 277
  19. 147
  20. 373
  21. 307
  22. 485
  23. 118
  24. 492
  25. 270
  26. 439
  27. 89
  28. 381
  29. 500
  30. 295
  31. 439
  32. 254
  33. 210
  34. 162
  35. 252
  36. 241
  37. 489
  38. 437
  39. 232
  40. 490

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