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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 410 · 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. 1.146 + 99 =
  2. 2.72 + 27 =
  3. 3.179 + 68 =
  4. 4.468 + 48 =
  5. 5.117 + 37 =
  6. 6.211 + 99 =
  7. 7.480 + 37 =
  8. 8.222 + 48 =
  9. 9.247 + 59 =
  10. 10.421 + 39 =
  11. 11.93 + 27 =
  12. 12.198 + 87 =
  13. 13.435 + 28 =
  14. 14.280 + 57 =
  15. 15.433 + 17 =
  16. 16.157 + 48 =
  17. 17.248 + 49 =
  18. 18.194 + 39 =
  19. 19.108 + 69 =
  20. 20.145 + 39 =
  21. 21.249 + 19 =
  22. 22.72 + 88 =
  23. 23.198 + 49 =
  24. 24.367 + 38 =
  25. 25.409 + 18 =
  26. 26.31 + 18 =
  27. 27.378 + 89 =
  28. 28.135 + 79 =
  29. 29.258 + 69 =
  30. 30.102 + 49 =
  31. 31.215 + 89 =
  32. 32.93 + 48 =
  33. 33.52 + 99 =
  34. 34.254 + 28 =
  35. 35.395 + 39 =
  36. 36.158 + 59 =
  37. 37.477 + 29 =
  38. 38.498 + 19 =
  39. 39.399 + 69 =
  40. 40.301 + 97 =

Answer key

  1. 245
  2. 99
  3. 247
  4. 516
  5. 154
  6. 310
  7. 517
  8. 270
  9. 306
  10. 460
  11. 120
  12. 285
  13. 463
  14. 337
  15. 450
  16. 205
  17. 297
  18. 233
  19. 177
  20. 184
  21. 268
  22. 160
  23. 247
  24. 405
  25. 427
  26. 49
  27. 467
  28. 214
  29. 327
  30. 151
  31. 304
  32. 141
  33. 151
  34. 282
  35. 434
  36. 217
  37. 506
  38. 517
  39. 468
  40. 398

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