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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 999 · 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. 1.451 + 88 =
  2. 2.132 + 67 =
  3. 3.397 + 97 =
  4. 4.364 + 87 =
  5. 5.259 + 59 =
  6. 6.465 + 79 =
  7. 7.246 + 29 =
  8. 8.369 + 88 =
  9. 9.292 + 69 =
  10. 10.408 + 89 =
  11. 11.350 + 97 =
  12. 12.353 + 57 =
  13. 13.417 + 68 =
  14. 14.445 + 39 =
  15. 15.88 + 19 =
  16. 16.89 + 49 =
  17. 17.329 + 69 =
  18. 18.200 + 69 =
  19. 19.454 + 68 =
  20. 20.232 + 18 =
  21. 21.401 + 57 =
  22. 22.274 + 99 =
  23. 23.131 + 99 =
  24. 24.363 + 58 =
  25. 25.275 + 67 =
  26. 26.318 + 18 =
  27. 27.109 + 59 =
  28. 28.59 + 99 =
  29. 29.276 + 69 =
  30. 30.218 + 48 =
  31. 31.337 + 79 =
  32. 32.120 + 87 =
  33. 33.223 + 27 =
  34. 34.284 + 97 =
  35. 35.375 + 97 =
  36. 36.76 + 27 =
  37. 37.202 + 17 =
  38. 38.32 + 99 =
  39. 39.343 + 98 =
  40. 40.66 + 49 =

Answer key

  1. 539
  2. 199
  3. 494
  4. 451
  5. 318
  6. 544
  7. 275
  8. 457
  9. 361
  10. 497
  11. 447
  12. 410
  13. 485
  14. 484
  15. 107
  16. 138
  17. 398
  18. 269
  19. 522
  20. 250
  21. 458
  22. 373
  23. 230
  24. 421
  25. 342
  26. 336
  27. 168
  28. 158
  29. 345
  30. 266
  31. 416
  32. 207
  33. 250
  34. 381
  35. 472
  36. 103
  37. 219
  38. 131
  39. 441
  40. 115

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