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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 803 · 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. 1.98 + 78 =
  2. 2.31 + 19 =
  3. 3.462 + 37 =
  4. 4.426 + 88 =
  5. 5.246 + 27 =
  6. 6.282 + 57 =
  7. 7.67 + 79 =
  8. 8.71 + 28 =
  9. 9.156 + 47 =
  10. 10.66 + 28 =
  11. 11.280 + 99 =
  12. 12.316 + 59 =
  13. 13.111 + 38 =
  14. 14.77 + 38 =
  15. 15.330 + 67 =
  16. 16.268 + 29 =
  17. 17.309 + 48 =
  18. 18.78 + 99 =
  19. 19.421 + 97 =
  20. 20.421 + 19 =
  21. 21.373 + 38 =
  22. 22.76 + 79 =
  23. 23.172 + 18 =
  24. 24.217 + 17 =
  25. 25.66 + 69 =
  26. 26.155 + 78 =
  27. 27.73 + 37 =
  28. 28.221 + 38 =
  29. 29.106 + 77 =
  30. 30.408 + 87 =
  31. 31.262 + 39 =
  32. 32.450 + 67 =
  33. 33.27 + 18 =
  34. 34.40 + 67 =
  35. 35.78 + 59 =
  36. 36.70 + 88 =
  37. 37.71 + 68 =
  38. 38.77 + 97 =
  39. 39.289 + 47 =
  40. 40.285 + 37 =

Answer key

  1. 176
  2. 50
  3. 499
  4. 514
  5. 273
  6. 339
  7. 146
  8. 99
  9. 203
  10. 94
  11. 379
  12. 375
  13. 149
  14. 115
  15. 397
  16. 297
  17. 357
  18. 177
  19. 518
  20. 440
  21. 411
  22. 155
  23. 190
  24. 234
  25. 135
  26. 233
  27. 110
  28. 259
  29. 183
  30. 495
  31. 301
  32. 517
  33. 45
  34. 107
  35. 137
  36. 158
  37. 139
  38. 174
  39. 336
  40. 322

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