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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 819 · 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. 1.104 + 98 =
  2. 2.106 + 29 =
  3. 3.369 + 67 =
  4. 4.91 + 98 =
  5. 5.260 + 38 =
  6. 6.266 + 37 =
  7. 7.266 + 37 =
  8. 8.390 + 19 =
  9. 9.470 + 27 =
  10. 10.360 + 47 =
  11. 11.190 + 17 =
  12. 12.299 + 69 =
  13. 13.435 + 29 =
  14. 14.385 + 37 =
  15. 15.201 + 89 =
  16. 16.307 + 18 =
  17. 17.70 + 49 =
  18. 18.334 + 37 =
  19. 19.364 + 57 =
  20. 20.95 + 89 =
  21. 21.350 + 68 =
  22. 22.401 + 29 =
  23. 23.431 + 88 =
  24. 24.387 + 17 =
  25. 25.343 + 78 =
  26. 26.362 + 99 =
  27. 27.353 + 87 =
  28. 28.259 + 18 =
  29. 29.198 + 99 =
  30. 30.28 + 28 =
  31. 31.410 + 49 =
  32. 32.287 + 17 =
  33. 33.240 + 77 =
  34. 34.299 + 98 =
  35. 35.465 + 18 =
  36. 36.326 + 97 =
  37. 37.56 + 78 =
  38. 38.83 + 29 =
  39. 39.293 + 27 =
  40. 40.109 + 57 =

Answer key

  1. 202
  2. 135
  3. 436
  4. 189
  5. 298
  6. 303
  7. 303
  8. 409
  9. 497
  10. 407
  11. 207
  12. 368
  13. 464
  14. 422
  15. 290
  16. 325
  17. 119
  18. 371
  19. 421
  20. 184
  21. 418
  22. 430
  23. 519
  24. 404
  25. 421
  26. 461
  27. 440
  28. 277
  29. 297
  30. 56
  31. 459
  32. 304
  33. 317
  34. 397
  35. 483
  36. 423
  37. 134
  38. 112
  39. 320
  40. 166

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