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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 211 · 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. 1.491 + 37 =
  2. 2.155 + 18 =
  3. 3.369 + 89 =
  4. 4.231 + 37 =
  5. 5.477 + 39 =
  6. 6.404 + 77 =
  7. 7.38 + 58 =
  8. 8.279 + 78 =
  9. 9.212 + 39 =
  10. 10.72 + 47 =
  11. 11.172 + 77 =
  12. 12.213 + 37 =
  13. 13.121 + 37 =
  14. 14.435 + 78 =
  15. 15.355 + 28 =
  16. 16.367 + 37 =
  17. 17.201 + 59 =
  18. 18.197 + 17 =
  19. 19.253 + 78 =
  20. 20.111 + 39 =
  21. 21.402 + 57 =
  22. 22.82 + 19 =
  23. 23.218 + 47 =
  24. 24.111 + 18 =
  25. 25.25 + 99 =
  26. 26.351 + 29 =
  27. 27.359 + 77 =
  28. 28.376 + 78 =
  29. 29.203 + 79 =
  30. 30.26 + 37 =
  31. 31.484 + 67 =
  32. 32.118 + 68 =
  33. 33.87 + 37 =
  34. 34.309 + 87 =
  35. 35.139 + 47 =
  36. 36.25 + 38 =
  37. 37.275 + 79 =
  38. 38.30 + 87 =
  39. 39.406 + 18 =
  40. 40.471 + 57 =

Answer key

  1. 528
  2. 173
  3. 458
  4. 268
  5. 516
  6. 481
  7. 96
  8. 357
  9. 251
  10. 119
  11. 249
  12. 250
  13. 158
  14. 513
  15. 383
  16. 404
  17. 260
  18. 214
  19. 331
  20. 150
  21. 459
  22. 101
  23. 265
  24. 129
  25. 124
  26. 380
  27. 436
  28. 454
  29. 282
  30. 63
  31. 551
  32. 186
  33. 124
  34. 396
  35. 186
  36. 63
  37. 354
  38. 117
  39. 424
  40. 528

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