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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 924 · 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. 1.273 + 88 =
  2. 2.135 + 97 =
  3. 3.40 + 78 =
  4. 4.73 + 97 =
  5. 5.436 + 79 =
  6. 6.266 + 18 =
  7. 7.245 + 47 =
  8. 8.256 + 98 =
  9. 9.58 + 67 =
  10. 10.214 + 69 =
  11. 11.278 + 99 =
  12. 12.202 + 99 =
  13. 13.389 + 88 =
  14. 14.202 + 39 =
  15. 15.116 + 27 =
  16. 16.240 + 78 =
  17. 17.317 + 77 =
  18. 18.304 + 69 =
  19. 19.406 + 57 =
  20. 20.341 + 89 =
  21. 21.25 + 59 =
  22. 22.249 + 67 =
  23. 23.161 + 78 =
  24. 24.313 + 89 =
  25. 25.406 + 77 =
  26. 26.64 + 57 =
  27. 27.477 + 18 =
  28. 28.461 + 68 =
  29. 29.456 + 38 =
  30. 30.493 + 29 =
  31. 31.94 + 28 =
  32. 32.215 + 48 =
  33. 33.50 + 69 =
  34. 34.352 + 17 =
  35. 35.65 + 18 =
  36. 36.495 + 58 =
  37. 37.291 + 67 =
  38. 38.442 + 77 =
  39. 39.423 + 19 =
  40. 40.451 + 29 =

Answer key

  1. 361
  2. 232
  3. 118
  4. 170
  5. 515
  6. 284
  7. 292
  8. 354
  9. 125
  10. 283
  11. 377
  12. 301
  13. 477
  14. 241
  15. 143
  16. 318
  17. 394
  18. 373
  19. 463
  20. 430
  21. 84
  22. 316
  23. 239
  24. 402
  25. 483
  26. 121
  27. 495
  28. 529
  29. 494
  30. 522
  31. 122
  32. 263
  33. 119
  34. 369
  35. 83
  36. 553
  37. 358
  38. 519
  39. 442
  40. 480

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