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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 994 · 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. 1.54 + 29 =
  2. 2.366 + 59 =
  3. 3.83 + 49 =
  4. 4.58 + 57 =
  5. 5.113 + 89 =
  6. 6.346 + 79 =
  7. 7.483 + 68 =
  8. 8.356 + 27 =
  9. 9.158 + 48 =
  10. 10.277 + 67 =
  11. 11.419 + 18 =
  12. 12.311 + 98 =
  13. 13.175 + 27 =
  14. 14.368 + 27 =
  15. 15.180 + 19 =
  16. 16.25 + 28 =
  17. 17.152 + 98 =
  18. 18.479 + 78 =
  19. 19.199 + 98 =
  20. 20.107 + 58 =
  21. 21.315 + 57 =
  22. 22.91 + 19 =
  23. 23.58 + 69 =
  24. 24.146 + 78 =
  25. 25.38 + 47 =
  26. 26.495 + 78 =
  27. 27.342 + 39 =
  28. 28.328 + 37 =
  29. 29.393 + 57 =
  30. 30.406 + 88 =
  31. 31.181 + 58 =
  32. 32.140 + 38 =
  33. 33.115 + 58 =
  34. 34.201 + 28 =
  35. 35.460 + 47 =
  36. 36.441 + 97 =
  37. 37.409 + 88 =
  38. 38.179 + 79 =
  39. 39.342 + 77 =
  40. 40.369 + 77 =

Answer key

  1. 83
  2. 425
  3. 132
  4. 115
  5. 202
  6. 425
  7. 551
  8. 383
  9. 206
  10. 344
  11. 437
  12. 409
  13. 202
  14. 395
  15. 199
  16. 53
  17. 250
  18. 557
  19. 297
  20. 165
  21. 372
  22. 110
  23. 127
  24. 224
  25. 85
  26. 573
  27. 381
  28. 365
  29. 450
  30. 494
  31. 239
  32. 178
  33. 173
  34. 229
  35. 507
  36. 538
  37. 497
  38. 258
  39. 419
  40. 446

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