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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 424 · 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. 1.212 + 78 =
  2. 2.119 + 98 =
  3. 3.306 + 98 =
  4. 4.150 + 87 =
  5. 5.43 + 58 =
  6. 6.411 + 27 =
  7. 7.144 + 17 =
  8. 8.99 + 27 =
  9. 9.397 + 19 =
  10. 10.233 + 68 =
  11. 11.196 + 47 =
  12. 12.363 + 48 =
  13. 13.237 + 28 =
  14. 14.198 + 19 =
  15. 15.473 + 38 =
  16. 16.324 + 79 =
  17. 17.25 + 29 =
  18. 18.233 + 19 =
  19. 19.495 + 27 =
  20. 20.76 + 37 =
  21. 21.115 + 87 =
  22. 22.115 + 89 =
  23. 23.33 + 68 =
  24. 24.384 + 67 =
  25. 25.177 + 67 =
  26. 26.395 + 48 =
  27. 27.72 + 18 =
  28. 28.457 + 28 =
  29. 29.344 + 38 =
  30. 30.365 + 28 =
  31. 31.325 + 27 =
  32. 32.464 + 29 =
  33. 33.308 + 18 =
  34. 34.446 + 27 =
  35. 35.398 + 89 =
  36. 36.473 + 47 =
  37. 37.333 + 67 =
  38. 38.39 + 67 =
  39. 39.127 + 78 =
  40. 40.162 + 28 =

Answer key

  1. 290
  2. 217
  3. 404
  4. 237
  5. 101
  6. 438
  7. 161
  8. 126
  9. 416
  10. 301
  11. 243
  12. 411
  13. 265
  14. 217
  15. 511
  16. 403
  17. 54
  18. 252
  19. 522
  20. 113
  21. 202
  22. 204
  23. 101
  24. 451
  25. 244
  26. 443
  27. 90
  28. 485
  29. 382
  30. 393
  31. 352
  32. 493
  33. 326
  34. 473
  35. 487
  36. 520
  37. 400
  38. 106
  39. 205
  40. 190

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