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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 963 · 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. 1.94 + 69 =
  2. 2.464 + 77 =
  3. 3.330 + 87 =
  4. 4.132 + 18 =
  5. 5.364 + 28 =
  6. 6.317 + 77 =
  7. 7.459 + 28 =
  8. 8.445 + 97 =
  9. 9.263 + 29 =
  10. 10.358 + 17 =
  11. 11.55 + 88 =
  12. 12.267 + 37 =
  13. 13.138 + 19 =
  14. 14.78 + 27 =
  15. 15.271 + 47 =
  16. 16.148 + 37 =
  17. 17.298 + 97 =
  18. 18.54 + 99 =
  19. 19.396 + 29 =
  20. 20.309 + 67 =
  21. 21.244 + 67 =
  22. 22.186 + 27 =
  23. 23.285 + 17 =
  24. 24.176 + 78 =
  25. 25.264 + 29 =
  26. 26.389 + 87 =
  27. 27.412 + 57 =
  28. 28.50 + 38 =
  29. 29.53 + 47 =
  30. 30.181 + 27 =
  31. 31.493 + 49 =
  32. 32.44 + 67 =
  33. 33.49 + 17 =
  34. 34.124 + 37 =
  35. 35.37 + 78 =
  36. 36.273 + 69 =
  37. 37.202 + 19 =
  38. 38.404 + 78 =
  39. 39.399 + 67 =
  40. 40.457 + 27 =

Answer key

  1. 163
  2. 541
  3. 417
  4. 150
  5. 392
  6. 394
  7. 487
  8. 542
  9. 292
  10. 375
  11. 143
  12. 304
  13. 157
  14. 105
  15. 318
  16. 185
  17. 395
  18. 153
  19. 425
  20. 376
  21. 311
  22. 213
  23. 302
  24. 254
  25. 293
  26. 476
  27. 469
  28. 88
  29. 100
  30. 208
  31. 542
  32. 111
  33. 66
  34. 161
  35. 115
  36. 342
  37. 221
  38. 482
  39. 466
  40. 484

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