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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 605 · 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. 1.328 + 77 =
  2. 2.473 + 89 =
  3. 3.419 + 18 =
  4. 4.54 + 28 =
  5. 5.441 + 47 =
  6. 6.31 + 98 =
  7. 7.93 + 17 =
  8. 8.52 + 58 =
  9. 9.164 + 18 =
  10. 10.304 + 97 =
  11. 11.35 + 98 =
  12. 12.29 + 27 =
  13. 13.475 + 49 =
  14. 14.67 + 89 =
  15. 15.393 + 97 =
  16. 16.74 + 27 =
  17. 17.475 + 17 =
  18. 18.132 + 38 =
  19. 19.178 + 49 =
  20. 20.264 + 47 =
  21. 21.391 + 67 =
  22. 22.315 + 19 =
  23. 23.373 + 49 =
  24. 24.214 + 19 =
  25. 25.191 + 88 =
  26. 26.97 + 37 =
  27. 27.252 + 89 =
  28. 28.231 + 67 =
  29. 29.162 + 49 =
  30. 30.279 + 17 =
  31. 31.338 + 18 =
  32. 32.213 + 37 =
  33. 33.400 + 19 =
  34. 34.81 + 19 =
  35. 35.476 + 37 =
  36. 36.248 + 37 =
  37. 37.109 + 57 =
  38. 38.386 + 27 =
  39. 39.162 + 19 =
  40. 40.137 + 37 =

Answer key

  1. 405
  2. 562
  3. 437
  4. 82
  5. 488
  6. 129
  7. 110
  8. 110
  9. 182
  10. 401
  11. 133
  12. 56
  13. 524
  14. 156
  15. 490
  16. 101
  17. 492
  18. 170
  19. 227
  20. 311
  21. 458
  22. 334
  23. 422
  24. 233
  25. 279
  26. 134
  27. 341
  28. 298
  29. 211
  30. 296
  31. 356
  32. 250
  33. 419
  34. 100
  35. 513
  36. 285
  37. 166
  38. 413
  39. 181
  40. 174

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