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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 903 · 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. 1.226 + 39 =
  2. 2.308 + 38 =
  3. 3.441 + 98 =
  4. 4.418 + 89 =
  5. 5.421 + 88 =
  6. 6.195 + 77 =
  7. 7.56 + 38 =
  8. 8.402 + 89 =
  9. 9.207 + 28 =
  10. 10.30 + 19 =
  11. 11.272 + 19 =
  12. 12.120 + 69 =
  13. 13.66 + 59 =
  14. 14.78 + 39 =
  15. 15.422 + 39 =
  16. 16.55 + 78 =
  17. 17.231 + 88 =
  18. 18.338 + 87 =
  19. 19.261 + 17 =
  20. 20.248 + 19 =
  21. 21.38 + 29 =
  22. 22.261 + 39 =
  23. 23.215 + 67 =
  24. 24.234 + 48 =
  25. 25.425 + 48 =
  26. 26.499 + 67 =
  27. 27.476 + 27 =
  28. 28.336 + 88 =
  29. 29.135 + 47 =
  30. 30.445 + 77 =
  31. 31.256 + 38 =
  32. 32.64 + 17 =
  33. 33.140 + 77 =
  34. 34.357 + 79 =
  35. 35.423 + 37 =
  36. 36.126 + 28 =
  37. 37.171 + 88 =
  38. 38.32 + 48 =
  39. 39.247 + 29 =
  40. 40.245 + 97 =

Answer key

  1. 265
  2. 346
  3. 539
  4. 507
  5. 509
  6. 272
  7. 94
  8. 491
  9. 235
  10. 49
  11. 291
  12. 189
  13. 125
  14. 117
  15. 461
  16. 133
  17. 319
  18. 425
  19. 278
  20. 267
  21. 67
  22. 300
  23. 282
  24. 282
  25. 473
  26. 566
  27. 503
  28. 424
  29. 182
  30. 522
  31. 294
  32. 81
  33. 217
  34. 436
  35. 460
  36. 154
  37. 259
  38. 80
  39. 276
  40. 342

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