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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 446 · 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. 1.340 + 77 =
  2. 2.26 + 28 =
  3. 3.68 + 58 =
  4. 4.493 + 88 =
  5. 5.42 + 77 =
  6. 6.288 + 87 =
  7. 7.56 + 28 =
  8. 8.294 + 79 =
  9. 9.324 + 37 =
  10. 10.195 + 18 =
  11. 11.133 + 28 =
  12. 12.317 + 37 =
  13. 13.439 + 19 =
  14. 14.167 + 67 =
  15. 15.330 + 17 =
  16. 16.214 + 88 =
  17. 17.416 + 78 =
  18. 18.126 + 28 =
  19. 19.259 + 59 =
  20. 20.192 + 78 =
  21. 21.198 + 17 =
  22. 22.495 + 87 =
  23. 23.46 + 28 =
  24. 24.97 + 47 =
  25. 25.218 + 29 =
  26. 26.45 + 87 =
  27. 27.376 + 47 =
  28. 28.484 + 37 =
  29. 29.37 + 38 =
  30. 30.129 + 98 =
  31. 31.77 + 38 =
  32. 32.351 + 67 =
  33. 33.499 + 99 =
  34. 34.112 + 77 =
  35. 35.248 + 37 =
  36. 36.176 + 88 =
  37. 37.316 + 97 =
  38. 38.364 + 99 =
  39. 39.53 + 39 =
  40. 40.309 + 99 =

Answer key

  1. 417
  2. 54
  3. 126
  4. 581
  5. 119
  6. 375
  7. 84
  8. 373
  9. 361
  10. 213
  11. 161
  12. 354
  13. 458
  14. 234
  15. 347
  16. 302
  17. 494
  18. 154
  19. 318
  20. 270
  21. 215
  22. 582
  23. 74
  24. 144
  25. 247
  26. 132
  27. 423
  28. 521
  29. 75
  30. 227
  31. 115
  32. 418
  33. 598
  34. 189
  35. 285
  36. 264
  37. 413
  38. 463
  39. 92
  40. 408

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