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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 934 · 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. 1.473 + 48 =
  2. 2.38 + 98 =
  3. 3.268 + 97 =
  4. 4.438 + 69 =
  5. 5.297 + 87 =
  6. 6.95 + 17 =
  7. 7.41 + 39 =
  8. 8.355 + 48 =
  9. 9.209 + 88 =
  10. 10.201 + 17 =
  11. 11.318 + 59 =
  12. 12.169 + 38 =
  13. 13.144 + 59 =
  14. 14.131 + 77 =
  15. 15.212 + 77 =
  16. 16.33 + 18 =
  17. 17.205 + 68 =
  18. 18.338 + 78 =
  19. 19.387 + 38 =
  20. 20.304 + 39 =
  21. 21.172 + 58 =
  22. 22.330 + 28 =
  23. 23.161 + 59 =
  24. 24.186 + 38 =
  25. 25.82 + 38 =
  26. 26.466 + 97 =
  27. 27.67 + 27 =
  28. 28.477 + 67 =
  29. 29.465 + 98 =
  30. 30.200 + 18 =
  31. 31.487 + 18 =
  32. 32.374 + 98 =
  33. 33.87 + 77 =
  34. 34.358 + 49 =
  35. 35.393 + 67 =
  36. 36.228 + 99 =
  37. 37.460 + 89 =
  38. 38.158 + 19 =
  39. 39.139 + 78 =
  40. 40.158 + 89 =

Answer key

  1. 521
  2. 136
  3. 365
  4. 507
  5. 384
  6. 112
  7. 80
  8. 403
  9. 297
  10. 218
  11. 377
  12. 207
  13. 203
  14. 208
  15. 289
  16. 51
  17. 273
  18. 416
  19. 425
  20. 343
  21. 230
  22. 358
  23. 220
  24. 224
  25. 120
  26. 563
  27. 94
  28. 544
  29. 563
  30. 218
  31. 505
  32. 472
  33. 164
  34. 407
  35. 460
  36. 327
  37. 549
  38. 177
  39. 217
  40. 247

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