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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 306 · 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. 1.309 + 19 =
  2. 2.420 + 18 =
  3. 3.234 + 27 =
  4. 4.188 + 28 =
  5. 5.390 + 98 =
  6. 6.130 + 37 =
  7. 7.96 + 39 =
  8. 8.94 + 68 =
  9. 9.224 + 18 =
  10. 10.481 + 89 =
  11. 11.111 + 39 =
  12. 12.245 + 19 =
  13. 13.114 + 28 =
  14. 14.450 + 47 =
  15. 15.449 + 68 =
  16. 16.242 + 28 =
  17. 17.56 + 37 =
  18. 18.427 + 67 =
  19. 19.156 + 27 =
  20. 20.335 + 48 =
  21. 21.98 + 68 =
  22. 22.90 + 39 =
  23. 23.378 + 87 =
  24. 24.311 + 38 =
  25. 25.259 + 49 =
  26. 26.357 + 78 =
  27. 27.268 + 17 =
  28. 28.167 + 77 =
  29. 29.189 + 39 =
  30. 30.88 + 38 =
  31. 31.56 + 57 =
  32. 32.264 + 79 =
  33. 33.420 + 69 =
  34. 34.98 + 68 =
  35. 35.261 + 57 =
  36. 36.368 + 88 =
  37. 37.243 + 17 =
  38. 38.126 + 78 =
  39. 39.189 + 28 =
  40. 40.144 + 87 =

Answer key

  1. 328
  2. 438
  3. 261
  4. 216
  5. 488
  6. 167
  7. 135
  8. 162
  9. 242
  10. 570
  11. 150
  12. 264
  13. 142
  14. 497
  15. 517
  16. 270
  17. 93
  18. 494
  19. 183
  20. 383
  21. 166
  22. 129
  23. 465
  24. 349
  25. 308
  26. 435
  27. 285
  28. 244
  29. 228
  30. 126
  31. 113
  32. 343
  33. 489
  34. 166
  35. 318
  36. 456
  37. 260
  38. 204
  39. 217
  40. 231

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