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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 53 · 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. 1.111 + 89 =
  2. 2.107 + 28 =
  3. 3.329 + 68 =
  4. 4.38 + 97 =
  5. 5.349 + 98 =
  6. 6.371 + 69 =
  7. 7.364 + 77 =
  8. 8.104 + 28 =
  9. 9.289 + 67 =
  10. 10.308 + 27 =
  11. 11.98 + 77 =
  12. 12.88 + 38 =
  13. 13.55 + 59 =
  14. 14.154 + 48 =
  15. 15.72 + 87 =
  16. 16.85 + 88 =
  17. 17.228 + 97 =
  18. 18.496 + 97 =
  19. 19.88 + 69 =
  20. 20.239 + 98 =
  21. 21.499 + 57 =
  22. 22.416 + 97 =
  23. 23.387 + 57 =
  24. 24.157 + 17 =
  25. 25.158 + 17 =
  26. 26.160 + 48 =
  27. 27.191 + 69 =
  28. 28.236 + 28 =
  29. 29.233 + 39 =
  30. 30.85 + 58 =
  31. 31.409 + 29 =
  32. 32.413 + 89 =
  33. 33.489 + 28 =
  34. 34.317 + 97 =
  35. 35.383 + 37 =
  36. 36.470 + 58 =
  37. 37.397 + 89 =
  38. 38.96 + 87 =
  39. 39.198 + 78 =
  40. 40.242 + 98 =

Answer key

  1. 200
  2. 135
  3. 397
  4. 135
  5. 447
  6. 440
  7. 441
  8. 132
  9. 356
  10. 335
  11. 175
  12. 126
  13. 114
  14. 202
  15. 159
  16. 173
  17. 325
  18. 593
  19. 157
  20. 337
  21. 556
  22. 513
  23. 444
  24. 174
  25. 175
  26. 208
  27. 260
  28. 264
  29. 272
  30. 143
  31. 438
  32. 502
  33. 517
  34. 414
  35. 420
  36. 528
  37. 486
  38. 183
  39. 276
  40. 340

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