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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 608 · 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. 1.211 + 78 =
  2. 2.112 + 77 =
  3. 3.370 + 58 =
  4. 4.475 + 68 =
  5. 5.108 + 19 =
  6. 6.175 + 47 =
  7. 7.443 + 69 =
  8. 8.112 + 39 =
  9. 9.367 + 19 =
  10. 10.322 + 37 =
  11. 11.426 + 17 =
  12. 12.343 + 39 =
  13. 13.393 + 39 =
  14. 14.32 + 27 =
  15. 15.219 + 79 =
  16. 16.307 + 99 =
  17. 17.194 + 47 =
  18. 18.410 + 69 =
  19. 19.42 + 78 =
  20. 20.480 + 19 =
  21. 21.414 + 87 =
  22. 22.274 + 79 =
  23. 23.105 + 27 =
  24. 24.410 + 79 =
  25. 25.167 + 68 =
  26. 26.408 + 78 =
  27. 27.381 + 49 =
  28. 28.406 + 77 =
  29. 29.182 + 88 =
  30. 30.179 + 17 =
  31. 31.291 + 29 =
  32. 32.237 + 28 =
  33. 33.397 + 38 =
  34. 34.196 + 98 =
  35. 35.60 + 38 =
  36. 36.252 + 67 =
  37. 37.355 + 68 =
  38. 38.272 + 78 =
  39. 39.498 + 48 =
  40. 40.460 + 98 =

Answer key

  1. 289
  2. 189
  3. 428
  4. 543
  5. 127
  6. 222
  7. 512
  8. 151
  9. 386
  10. 359
  11. 443
  12. 382
  13. 432
  14. 59
  15. 298
  16. 406
  17. 241
  18. 479
  19. 120
  20. 499
  21. 501
  22. 353
  23. 132
  24. 489
  25. 235
  26. 486
  27. 430
  28. 483
  29. 270
  30. 196
  31. 320
  32. 265
  33. 435
  34. 294
  35. 98
  36. 319
  37. 423
  38. 350
  39. 546
  40. 558

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