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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 885 · 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. 1.319 + 29 =
  2. 2.355 + 18 =
  3. 3.134 + 59 =
  4. 4.238 + 87 =
  5. 5.103 + 97 =
  6. 6.127 + 48 =
  7. 7.463 + 99 =
  8. 8.452 + 98 =
  9. 9.407 + 99 =
  10. 10.476 + 58 =
  11. 11.84 + 99 =
  12. 12.267 + 28 =
  13. 13.491 + 27 =
  14. 14.38 + 99 =
  15. 15.318 + 27 =
  16. 16.68 + 77 =
  17. 17.388 + 88 =
  18. 18.249 + 49 =
  19. 19.306 + 29 =
  20. 20.133 + 47 =
  21. 21.270 + 97 =
  22. 22.151 + 98 =
  23. 23.283 + 89 =
  24. 24.396 + 67 =
  25. 25.229 + 19 =
  26. 26.386 + 49 =
  27. 27.133 + 49 =
  28. 28.374 + 99 =
  29. 29.373 + 97 =
  30. 30.453 + 18 =
  31. 31.94 + 19 =
  32. 32.453 + 87 =
  33. 33.307 + 97 =
  34. 34.80 + 37 =
  35. 35.68 + 48 =
  36. 36.51 + 18 =
  37. 37.124 + 37 =
  38. 38.195 + 78 =
  39. 39.272 + 17 =
  40. 40.231 + 78 =

Answer key

  1. 348
  2. 373
  3. 193
  4. 325
  5. 200
  6. 175
  7. 562
  8. 550
  9. 506
  10. 534
  11. 183
  12. 295
  13. 518
  14. 137
  15. 345
  16. 145
  17. 476
  18. 298
  19. 335
  20. 180
  21. 367
  22. 249
  23. 372
  24. 463
  25. 248
  26. 435
  27. 182
  28. 473
  29. 470
  30. 471
  31. 113
  32. 540
  33. 404
  34. 117
  35. 116
  36. 69
  37. 161
  38. 273
  39. 289
  40. 309

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