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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 411 · 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. 1.136 + 79 =
  2. 2.59 + 97 =
  3. 3.170 + 98 =
  4. 4.46 + 48 =
  5. 5.421 + 98 =
  6. 6.124 + 67 =
  7. 7.496 + 88 =
  8. 8.43 + 48 =
  9. 9.486 + 49 =
  10. 10.166 + 77 =
  11. 11.468 + 89 =
  12. 12.186 + 39 =
  13. 13.135 + 68 =
  14. 14.117 + 67 =
  15. 15.228 + 99 =
  16. 16.322 + 68 =
  17. 17.65 + 47 =
  18. 18.468 + 78 =
  19. 19.67 + 17 =
  20. 20.66 + 57 =
  21. 21.110 + 27 =
  22. 22.391 + 98 =
  23. 23.400 + 67 =
  24. 24.93 + 68 =
  25. 25.460 + 78 =
  26. 26.47 + 49 =
  27. 27.247 + 39 =
  28. 28.343 + 28 =
  29. 29.225 + 69 =
  30. 30.216 + 89 =
  31. 31.111 + 89 =
  32. 32.478 + 27 =
  33. 33.71 + 87 =
  34. 34.218 + 59 =
  35. 35.303 + 87 =
  36. 36.135 + 17 =
  37. 37.473 + 97 =
  38. 38.145 + 17 =
  39. 39.66 + 39 =
  40. 40.332 + 57 =

Answer key

  1. 215
  2. 156
  3. 268
  4. 94
  5. 519
  6. 191
  7. 584
  8. 91
  9. 535
  10. 243
  11. 557
  12. 225
  13. 203
  14. 184
  15. 327
  16. 390
  17. 112
  18. 546
  19. 84
  20. 123
  21. 137
  22. 489
  23. 467
  24. 161
  25. 538
  26. 96
  27. 286
  28. 371
  29. 294
  30. 305
  31. 200
  32. 505
  33. 158
  34. 277
  35. 390
  36. 152
  37. 570
  38. 162
  39. 105
  40. 389

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