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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 93 · 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. 1.188 + 59 =
  2. 2.447 + 99 =
  3. 3.266 + 58 =
  4. 4.289 + 47 =
  5. 5.71 + 58 =
  6. 6.420 + 19 =
  7. 7.453 + 89 =
  8. 8.58 + 17 =
  9. 9.230 + 89 =
  10. 10.264 + 48 =
  11. 11.159 + 87 =
  12. 12.225 + 88 =
  13. 13.407 + 37 =
  14. 14.238 + 27 =
  15. 15.356 + 67 =
  16. 16.199 + 57 =
  17. 17.156 + 17 =
  18. 18.155 + 27 =
  19. 19.335 + 77 =
  20. 20.221 + 49 =
  21. 21.167 + 99 =
  22. 22.43 + 39 =
  23. 23.331 + 68 =
  24. 24.85 + 38 =
  25. 25.78 + 78 =
  26. 26.363 + 27 =
  27. 27.174 + 58 =
  28. 28.233 + 27 =
  29. 29.356 + 57 =
  30. 30.318 + 88 =
  31. 31.309 + 38 =
  32. 32.49 + 17 =
  33. 33.287 + 39 =
  34. 34.137 + 77 =
  35. 35.433 + 27 =
  36. 36.342 + 29 =
  37. 37.38 + 67 =
  38. 38.140 + 38 =
  39. 39.47 + 28 =
  40. 40.240 + 18 =

Answer key

  1. 247
  2. 546
  3. 324
  4. 336
  5. 129
  6. 439
  7. 542
  8. 75
  9. 319
  10. 312
  11. 246
  12. 313
  13. 444
  14. 265
  15. 423
  16. 256
  17. 173
  18. 182
  19. 412
  20. 270
  21. 266
  22. 82
  23. 399
  24. 123
  25. 156
  26. 390
  27. 232
  28. 260
  29. 413
  30. 406
  31. 347
  32. 66
  33. 326
  34. 214
  35. 460
  36. 371
  37. 105
  38. 178
  39. 75
  40. 258

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