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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 610 · 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. 1.209 + 29 =
  2. 2.204 + 17 =
  3. 3.465 + 17 =
  4. 4.133 + 87 =
  5. 5.453 + 78 =
  6. 6.242 + 18 =
  7. 7.174 + 97 =
  8. 8.28 + 39 =
  9. 9.364 + 68 =
  10. 10.439 + 59 =
  11. 11.331 + 79 =
  12. 12.344 + 29 =
  13. 13.409 + 98 =
  14. 14.357 + 38 =
  15. 15.81 + 98 =
  16. 16.482 + 39 =
  17. 17.415 + 39 =
  18. 18.479 + 49 =
  19. 19.253 + 48 =
  20. 20.460 + 48 =
  21. 21.424 + 67 =
  22. 22.112 + 98 =
  23. 23.396 + 87 =
  24. 24.231 + 89 =
  25. 25.111 + 97 =
  26. 26.109 + 77 =
  27. 27.197 + 99 =
  28. 28.272 + 79 =
  29. 29.25 + 28 =
  30. 30.324 + 27 =
  31. 31.482 + 67 =
  32. 32.36 + 37 =
  33. 33.126 + 27 =
  34. 34.258 + 88 =
  35. 35.145 + 57 =
  36. 36.445 + 77 =
  37. 37.155 + 79 =
  38. 38.377 + 79 =
  39. 39.152 + 49 =
  40. 40.69 + 67 =

Answer key

  1. 238
  2. 221
  3. 482
  4. 220
  5. 531
  6. 260
  7. 271
  8. 67
  9. 432
  10. 498
  11. 410
  12. 373
  13. 507
  14. 395
  15. 179
  16. 521
  17. 454
  18. 528
  19. 301
  20. 508
  21. 491
  22. 210
  23. 483
  24. 320
  25. 208
  26. 186
  27. 296
  28. 351
  29. 53
  30. 351
  31. 549
  32. 73
  33. 153
  34. 346
  35. 202
  36. 522
  37. 234
  38. 456
  39. 201
  40. 136

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