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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 598 · 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. 1.272 + 19 =
  2. 2.35 + 18 =
  3. 3.447 + 78 =
  4. 4.33 + 79 =
  5. 5.428 + 17 =
  6. 6.347 + 78 =
  7. 7.201 + 79 =
  8. 8.36 + 99 =
  9. 9.182 + 79 =
  10. 10.303 + 88 =
  11. 11.407 + 57 =
  12. 12.193 + 78 =
  13. 13.29 + 29 =
  14. 14.141 + 17 =
  15. 15.299 + 49 =
  16. 16.167 + 98 =
  17. 17.41 + 59 =
  18. 18.229 + 67 =
  19. 19.499 + 27 =
  20. 20.346 + 87 =
  21. 21.211 + 38 =
  22. 22.212 + 28 =
  23. 23.74 + 77 =
  24. 24.75 + 77 =
  25. 25.449 + 68 =
  26. 26.433 + 87 =
  27. 27.161 + 59 =
  28. 28.308 + 39 =
  29. 29.133 + 78 =
  30. 30.240 + 57 =
  31. 31.78 + 27 =
  32. 32.62 + 67 =
  33. 33.45 + 78 =
  34. 34.75 + 19 =
  35. 35.81 + 18 =
  36. 36.215 + 47 =
  37. 37.137 + 88 =
  38. 38.30 + 68 =
  39. 39.116 + 87 =
  40. 40.31 + 68 =

Answer key

  1. 291
  2. 53
  3. 525
  4. 112
  5. 445
  6. 425
  7. 280
  8. 135
  9. 261
  10. 391
  11. 464
  12. 271
  13. 58
  14. 158
  15. 348
  16. 265
  17. 100
  18. 296
  19. 526
  20. 433
  21. 249
  22. 240
  23. 151
  24. 152
  25. 517
  26. 520
  27. 220
  28. 347
  29. 211
  30. 297
  31. 105
  32. 129
  33. 123
  34. 94
  35. 99
  36. 262
  37. 225
  38. 98
  39. 203
  40. 99

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