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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 846 · 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. 1.43 + 79 =
  2. 2.280 + 68 =
  3. 3.453 + 17 =
  4. 4.466 + 79 =
  5. 5.451 + 39 =
  6. 6.128 + 57 =
  7. 7.262 + 97 =
  8. 8.389 + 27 =
  9. 9.80 + 19 =
  10. 10.174 + 38 =
  11. 11.311 + 37 =
  12. 12.365 + 29 =
  13. 13.493 + 49 =
  14. 14.318 + 37 =
  15. 15.299 + 58 =
  16. 16.194 + 98 =
  17. 17.434 + 69 =
  18. 18.107 + 17 =
  19. 19.253 + 79 =
  20. 20.88 + 18 =
  21. 21.406 + 19 =
  22. 22.197 + 78 =
  23. 23.253 + 17 =
  24. 24.200 + 38 =
  25. 25.206 + 38 =
  26. 26.473 + 57 =
  27. 27.490 + 27 =
  28. 28.393 + 87 =
  29. 29.462 + 67 =
  30. 30.441 + 97 =
  31. 31.328 + 18 =
  32. 32.361 + 67 =
  33. 33.479 + 87 =
  34. 34.336 + 78 =
  35. 35.219 + 99 =
  36. 36.204 + 39 =
  37. 37.73 + 18 =
  38. 38.79 + 29 =
  39. 39.133 + 39 =
  40. 40.50 + 17 =

Answer key

  1. 122
  2. 348
  3. 470
  4. 545
  5. 490
  6. 185
  7. 359
  8. 416
  9. 99
  10. 212
  11. 348
  12. 394
  13. 542
  14. 355
  15. 357
  16. 292
  17. 503
  18. 124
  19. 332
  20. 106
  21. 425
  22. 275
  23. 270
  24. 238
  25. 244
  26. 530
  27. 517
  28. 480
  29. 529
  30. 538
  31. 346
  32. 428
  33. 566
  34. 414
  35. 318
  36. 243
  37. 91
  38. 108
  39. 172
  40. 67

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