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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 295 · 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. 1.291 + 69 =
  2. 2.122 + 38 =
  3. 3.490 + 97 =
  4. 4.451 + 59 =
  5. 5.426 + 39 =
  6. 6.359 + 89 =
  7. 7.32 + 48 =
  8. 8.209 + 18 =
  9. 9.380 + 89 =
  10. 10.342 + 49 =
  11. 11.147 + 97 =
  12. 12.277 + 29 =
  13. 13.246 + 79 =
  14. 14.161 + 87 =
  15. 15.494 + 87 =
  16. 16.433 + 18 =
  17. 17.412 + 67 =
  18. 18.351 + 57 =
  19. 19.235 + 87 =
  20. 20.468 + 39 =
  21. 21.492 + 68 =
  22. 22.325 + 79 =
  23. 23.136 + 87 =
  24. 24.406 + 28 =
  25. 25.474 + 28 =
  26. 26.166 + 27 =
  27. 27.219 + 47 =
  28. 28.448 + 28 =
  29. 29.124 + 29 =
  30. 30.117 + 17 =
  31. 31.390 + 67 =
  32. 32.175 + 79 =
  33. 33.302 + 48 =
  34. 34.286 + 78 =
  35. 35.199 + 77 =
  36. 36.160 + 88 =
  37. 37.177 + 97 =
  38. 38.141 + 59 =
  39. 39.397 + 57 =
  40. 40.276 + 79 =

Answer key

  1. 360
  2. 160
  3. 587
  4. 510
  5. 465
  6. 448
  7. 80
  8. 227
  9. 469
  10. 391
  11. 244
  12. 306
  13. 325
  14. 248
  15. 581
  16. 451
  17. 479
  18. 408
  19. 322
  20. 507
  21. 560
  22. 404
  23. 223
  24. 434
  25. 502
  26. 193
  27. 266
  28. 476
  29. 153
  30. 134
  31. 457
  32. 254
  33. 350
  34. 364
  35. 276
  36. 248
  37. 274
  38. 200
  39. 454
  40. 355

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