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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 826 · 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. 1.45 + 38 =
  2. 2.143 + 39 =
  3. 3.201 + 87 =
  4. 4.435 + 68 =
  5. 5.235 + 87 =
  6. 6.135 + 59 =
  7. 7.480 + 77 =
  8. 8.126 + 37 =
  9. 9.332 + 78 =
  10. 10.68 + 57 =
  11. 11.422 + 28 =
  12. 12.365 + 67 =
  13. 13.295 + 79 =
  14. 14.101 + 68 =
  15. 15.178 + 58 =
  16. 16.485 + 39 =
  17. 17.339 + 77 =
  18. 18.53 + 78 =
  19. 19.165 + 88 =
  20. 20.452 + 29 =
  21. 21.383 + 38 =
  22. 22.382 + 28 =
  23. 23.437 + 17 =
  24. 24.332 + 49 =
  25. 25.439 + 87 =
  26. 26.463 + 98 =
  27. 27.240 + 37 =
  28. 28.239 + 67 =
  29. 29.66 + 57 =
  30. 30.355 + 39 =
  31. 31.489 + 19 =
  32. 32.275 + 17 =
  33. 33.191 + 27 =
  34. 34.388 + 58 =
  35. 35.319 + 68 =
  36. 36.494 + 67 =
  37. 37.320 + 29 =
  38. 38.485 + 69 =
  39. 39.230 + 18 =
  40. 40.242 + 57 =

Answer key

  1. 83
  2. 182
  3. 288
  4. 503
  5. 322
  6. 194
  7. 557
  8. 163
  9. 410
  10. 125
  11. 450
  12. 432
  13. 374
  14. 169
  15. 236
  16. 524
  17. 416
  18. 131
  19. 253
  20. 481
  21. 421
  22. 410
  23. 454
  24. 381
  25. 526
  26. 561
  27. 277
  28. 306
  29. 123
  30. 394
  31. 508
  32. 292
  33. 218
  34. 446
  35. 387
  36. 561
  37. 349
  38. 554
  39. 248
  40. 299

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