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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 145 · 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. 1.278 + 98 =
  2. 2.337 + 47 =
  3. 3.274 + 19 =
  4. 4.294 + 97 =
  5. 5.157 + 17 =
  6. 6.314 + 18 =
  7. 7.302 + 87 =
  8. 8.273 + 98 =
  9. 9.478 + 17 =
  10. 10.436 + 59 =
  11. 11.163 + 18 =
  12. 12.394 + 19 =
  13. 13.361 + 98 =
  14. 14.277 + 37 =
  15. 15.137 + 19 =
  16. 16.381 + 38 =
  17. 17.104 + 17 =
  18. 18.175 + 28 =
  19. 19.422 + 37 =
  20. 20.237 + 78 =
  21. 21.178 + 99 =
  22. 22.492 + 57 =
  23. 23.59 + 79 =
  24. 24.493 + 79 =
  25. 25.202 + 37 =
  26. 26.390 + 57 =
  27. 27.352 + 19 =
  28. 28.475 + 89 =
  29. 29.100 + 77 =
  30. 30.432 + 49 =
  31. 31.92 + 27 =
  32. 32.326 + 68 =
  33. 33.354 + 59 =
  34. 34.451 + 48 =
  35. 35.380 + 77 =
  36. 36.417 + 69 =
  37. 37.453 + 78 =
  38. 38.215 + 47 =
  39. 39.461 + 37 =
  40. 40.284 + 38 =

Answer key

  1. 376
  2. 384
  3. 293
  4. 391
  5. 174
  6. 332
  7. 389
  8. 371
  9. 495
  10. 495
  11. 181
  12. 413
  13. 459
  14. 314
  15. 156
  16. 419
  17. 121
  18. 203
  19. 459
  20. 315
  21. 277
  22. 549
  23. 138
  24. 572
  25. 239
  26. 447
  27. 371
  28. 564
  29. 177
  30. 481
  31. 119
  32. 394
  33. 413
  34. 499
  35. 457
  36. 486
  37. 531
  38. 262
  39. 498
  40. 322

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