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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 694 · 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. 1.219 + 49 =
  2. 2.167 + 48 =
  3. 3.134 + 48 =
  4. 4.82 + 27 =
  5. 5.259 + 58 =
  6. 6.219 + 17 =
  7. 7.330 + 68 =
  8. 8.214 + 19 =
  9. 9.486 + 78 =
  10. 10.189 + 88 =
  11. 11.315 + 28 =
  12. 12.42 + 97 =
  13. 13.61 + 19 =
  14. 14.82 + 38 =
  15. 15.395 + 58 =
  16. 16.112 + 19 =
  17. 17.485 + 99 =
  18. 18.248 + 27 =
  19. 19.325 + 39 =
  20. 20.36 + 28 =
  21. 21.370 + 97 =
  22. 22.51 + 88 =
  23. 23.43 + 47 =
  24. 24.38 + 27 =
  25. 25.283 + 67 =
  26. 26.26 + 69 =
  27. 27.402 + 79 =
  28. 28.365 + 57 =
  29. 29.455 + 98 =
  30. 30.51 + 77 =
  31. 31.174 + 48 =
  32. 32.382 + 78 =
  33. 33.409 + 78 =
  34. 34.262 + 68 =
  35. 35.457 + 37 =
  36. 36.226 + 19 =
  37. 37.288 + 27 =
  38. 38.68 + 19 =
  39. 39.148 + 47 =
  40. 40.374 + 77 =

Answer key

  1. 268
  2. 215
  3. 182
  4. 109
  5. 317
  6. 236
  7. 398
  8. 233
  9. 564
  10. 277
  11. 343
  12. 139
  13. 80
  14. 120
  15. 453
  16. 131
  17. 584
  18. 275
  19. 364
  20. 64
  21. 467
  22. 139
  23. 90
  24. 65
  25. 350
  26. 95
  27. 481
  28. 422
  29. 553
  30. 128
  31. 222
  32. 460
  33. 487
  34. 330
  35. 494
  36. 245
  37. 315
  38. 87
  39. 195
  40. 451

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