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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 799 · 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. 1.380 + 57 =
  2. 2.335 + 49 =
  3. 3.369 + 38 =
  4. 4.319 + 18 =
  5. 5.376 + 49 =
  6. 6.287 + 98 =
  7. 7.88 + 87 =
  8. 8.420 + 87 =
  9. 9.108 + 49 =
  10. 10.414 + 59 =
  11. 11.170 + 28 =
  12. 12.158 + 89 =
  13. 13.276 + 57 =
  14. 14.77 + 18 =
  15. 15.73 + 97 =
  16. 16.397 + 89 =
  17. 17.180 + 58 =
  18. 18.47 + 97 =
  19. 19.341 + 87 =
  20. 20.98 + 87 =
  21. 21.463 + 49 =
  22. 22.56 + 57 =
  23. 23.264 + 89 =
  24. 24.446 + 27 =
  25. 25.271 + 28 =
  26. 26.289 + 67 =
  27. 27.77 + 49 =
  28. 28.275 + 97 =
  29. 29.34 + 67 =
  30. 30.266 + 39 =
  31. 31.257 + 79 =
  32. 32.298 + 18 =
  33. 33.469 + 28 =
  34. 34.313 + 69 =
  35. 35.284 + 87 =
  36. 36.49 + 69 =
  37. 37.484 + 39 =
  38. 38.47 + 37 =
  39. 39.473 + 57 =
  40. 40.78 + 99 =

Answer key

  1. 437
  2. 384
  3. 407
  4. 337
  5. 425
  6. 385
  7. 175
  8. 507
  9. 157
  10. 473
  11. 198
  12. 247
  13. 333
  14. 95
  15. 170
  16. 486
  17. 238
  18. 144
  19. 428
  20. 185
  21. 512
  22. 113
  23. 353
  24. 473
  25. 299
  26. 356
  27. 126
  28. 372
  29. 101
  30. 305
  31. 336
  32. 316
  33. 497
  34. 382
  35. 371
  36. 118
  37. 523
  38. 84
  39. 530
  40. 177

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