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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 888 · 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. 1.370 + 47 =
  2. 2.208 + 58 =
  3. 3.428 + 48 =
  4. 4.178 + 37 =
  5. 5.299 + 49 =
  6. 6.80 + 78 =
  7. 7.263 + 97 =
  8. 8.374 + 27 =
  9. 9.172 + 88 =
  10. 10.67 + 48 =
  11. 11.133 + 17 =
  12. 12.26 + 97 =
  13. 13.332 + 68 =
  14. 14.476 + 28 =
  15. 15.233 + 28 =
  16. 16.276 + 18 =
  17. 17.106 + 59 =
  18. 18.334 + 37 =
  19. 19.400 + 28 =
  20. 20.391 + 47 =
  21. 21.367 + 17 =
  22. 22.163 + 99 =
  23. 23.328 + 79 =
  24. 24.191 + 87 =
  25. 25.446 + 17 =
  26. 26.259 + 17 =
  27. 27.89 + 98 =
  28. 28.50 + 97 =
  29. 29.362 + 98 =
  30. 30.72 + 27 =
  31. 31.308 + 17 =
  32. 32.225 + 57 =
  33. 33.150 + 37 =
  34. 34.398 + 28 =
  35. 35.287 + 87 =
  36. 36.241 + 29 =
  37. 37.450 + 77 =
  38. 38.471 + 37 =
  39. 39.137 + 59 =
  40. 40.352 + 67 =

Answer key

  1. 417
  2. 266
  3. 476
  4. 215
  5. 348
  6. 158
  7. 360
  8. 401
  9. 260
  10. 115
  11. 150
  12. 123
  13. 400
  14. 504
  15. 261
  16. 294
  17. 165
  18. 371
  19. 428
  20. 438
  21. 384
  22. 262
  23. 407
  24. 278
  25. 463
  26. 276
  27. 187
  28. 147
  29. 460
  30. 99
  31. 325
  32. 282
  33. 187
  34. 426
  35. 374
  36. 270
  37. 527
  38. 508
  39. 196
  40. 419

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