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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 57 · 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. 1.99 + 87 =
  2. 2.402 + 68 =
  3. 3.43 + 18 =
  4. 4.382 + 58 =
  5. 5.168 + 39 =
  6. 6.447 + 27 =
  7. 7.200 + 97 =
  8. 8.180 + 19 =
  9. 9.100 + 68 =
  10. 10.135 + 47 =
  11. 11.115 + 48 =
  12. 12.280 + 59 =
  13. 13.390 + 29 =
  14. 14.414 + 38 =
  15. 15.495 + 18 =
  16. 16.165 + 69 =
  17. 17.77 + 29 =
  18. 18.248 + 79 =
  19. 19.77 + 39 =
  20. 20.32 + 28 =
  21. 21.499 + 29 =
  22. 22.60 + 39 =
  23. 23.406 + 27 =
  24. 24.30 + 67 =
  25. 25.55 + 98 =
  26. 26.243 + 48 =
  27. 27.273 + 39 =
  28. 28.118 + 37 =
  29. 29.335 + 17 =
  30. 30.349 + 89 =
  31. 31.247 + 79 =
  32. 32.379 + 97 =
  33. 33.307 + 89 =
  34. 34.98 + 88 =
  35. 35.194 + 57 =
  36. 36.496 + 87 =
  37. 37.442 + 78 =
  38. 38.371 + 18 =
  39. 39.455 + 57 =
  40. 40.61 + 19 =

Answer key

  1. 186
  2. 470
  3. 61
  4. 440
  5. 207
  6. 474
  7. 297
  8. 199
  9. 168
  10. 182
  11. 163
  12. 339
  13. 419
  14. 452
  15. 513
  16. 234
  17. 106
  18. 327
  19. 116
  20. 60
  21. 528
  22. 99
  23. 433
  24. 97
  25. 153
  26. 291
  27. 312
  28. 155
  29. 352
  30. 438
  31. 326
  32. 476
  33. 396
  34. 186
  35. 251
  36. 583
  37. 520
  38. 389
  39. 512
  40. 80

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