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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 222 · 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. 1.176 + 27 =
  2. 2.348 + 27 =
  3. 3.224 + 27 =
  4. 4.417 + 88 =
  5. 5.83 + 29 =
  6. 6.439 + 57 =
  7. 7.217 + 37 =
  8. 8.497 + 28 =
  9. 9.74 + 77 =
  10. 10.465 + 57 =
  11. 11.207 + 28 =
  12. 12.451 + 48 =
  13. 13.489 + 48 =
  14. 14.472 + 57 =
  15. 15.50 + 79 =
  16. 16.110 + 67 =
  17. 17.117 + 69 =
  18. 18.103 + 88 =
  19. 19.305 + 87 =
  20. 20.477 + 18 =
  21. 21.312 + 58 =
  22. 22.159 + 87 =
  23. 23.414 + 68 =
  24. 24.272 + 68 =
  25. 25.398 + 79 =
  26. 26.329 + 89 =
  27. 27.120 + 39 =
  28. 28.310 + 47 =
  29. 29.420 + 78 =
  30. 30.80 + 68 =
  31. 31.204 + 18 =
  32. 32.158 + 79 =
  33. 33.397 + 97 =
  34. 34.192 + 97 =
  35. 35.240 + 88 =
  36. 36.329 + 59 =
  37. 37.406 + 27 =
  38. 38.110 + 18 =
  39. 39.336 + 39 =
  40. 40.115 + 37 =

Answer key

  1. 203
  2. 375
  3. 251
  4. 505
  5. 112
  6. 496
  7. 254
  8. 525
  9. 151
  10. 522
  11. 235
  12. 499
  13. 537
  14. 529
  15. 129
  16. 177
  17. 186
  18. 191
  19. 392
  20. 495
  21. 370
  22. 246
  23. 482
  24. 340
  25. 477
  26. 418
  27. 159
  28. 357
  29. 498
  30. 148
  31. 222
  32. 237
  33. 494
  34. 289
  35. 328
  36. 388
  37. 433
  38. 128
  39. 375
  40. 152

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