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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 995 · 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. 1.463 + 28 =
  2. 2.384 + 98 =
  3. 3.422 + 59 =
  4. 4.491 + 18 =
  5. 5.284 + 28 =
  6. 6.279 + 19 =
  7. 7.375 + 68 =
  8. 8.329 + 37 =
  9. 9.38 + 87 =
  10. 10.25 + 49 =
  11. 11.68 + 97 =
  12. 12.240 + 58 =
  13. 13.430 + 47 =
  14. 14.96 + 39 =
  15. 15.404 + 58 =
  16. 16.431 + 17 =
  17. 17.441 + 37 =
  18. 18.458 + 59 =
  19. 19.209 + 38 =
  20. 20.117 + 97 =
  21. 21.245 + 49 =
  22. 22.106 + 69 =
  23. 23.91 + 88 =
  24. 24.69 + 28 =
  25. 25.321 + 77 =
  26. 26.115 + 89 =
  27. 27.313 + 17 =
  28. 28.47 + 29 =
  29. 29.221 + 57 =
  30. 30.421 + 79 =
  31. 31.333 + 98 =
  32. 32.282 + 39 =
  33. 33.127 + 79 =
  34. 34.337 + 79 =
  35. 35.267 + 17 =
  36. 36.386 + 59 =
  37. 37.473 + 88 =
  38. 38.455 + 89 =
  39. 39.26 + 47 =
  40. 40.180 + 28 =

Answer key

  1. 491
  2. 482
  3. 481
  4. 509
  5. 312
  6. 298
  7. 443
  8. 366
  9. 125
  10. 74
  11. 165
  12. 298
  13. 477
  14. 135
  15. 462
  16. 448
  17. 478
  18. 517
  19. 247
  20. 214
  21. 294
  22. 175
  23. 179
  24. 97
  25. 398
  26. 204
  27. 330
  28. 76
  29. 278
  30. 500
  31. 431
  32. 321
  33. 206
  34. 416
  35. 284
  36. 445
  37. 561
  38. 544
  39. 73
  40. 208

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