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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 919 · 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. 1.209 + 19 =
  2. 2.221 + 28 =
  3. 3.41 + 49 =
  4. 4.286 + 28 =
  5. 5.359 + 39 =
  6. 6.306 + 89 =
  7. 7.374 + 37 =
  8. 8.252 + 49 =
  9. 9.93 + 17 =
  10. 10.144 + 49 =
  11. 11.366 + 58 =
  12. 12.35 + 88 =
  13. 13.499 + 99 =
  14. 14.119 + 87 =
  15. 15.376 + 79 =
  16. 16.396 + 27 =
  17. 17.340 + 59 =
  18. 18.335 + 57 =
  19. 19.384 + 47 =
  20. 20.61 + 27 =
  21. 21.399 + 59 =
  22. 22.456 + 17 =
  23. 23.353 + 69 =
  24. 24.215 + 97 =
  25. 25.133 + 39 =
  26. 26.434 + 59 =
  27. 27.206 + 68 =
  28. 28.141 + 18 =
  29. 29.292 + 57 =
  30. 30.241 + 97 =
  31. 31.165 + 19 =
  32. 32.337 + 59 =
  33. 33.253 + 19 =
  34. 34.239 + 48 =
  35. 35.393 + 87 =
  36. 36.181 + 68 =
  37. 37.404 + 77 =
  38. 38.363 + 17 =
  39. 39.310 + 17 =
  40. 40.493 + 38 =

Answer key

  1. 228
  2. 249
  3. 90
  4. 314
  5. 398
  6. 395
  7. 411
  8. 301
  9. 110
  10. 193
  11. 424
  12. 123
  13. 598
  14. 206
  15. 455
  16. 423
  17. 399
  18. 392
  19. 431
  20. 88
  21. 458
  22. 473
  23. 422
  24. 312
  25. 172
  26. 493
  27. 274
  28. 159
  29. 349
  30. 338
  31. 184
  32. 396
  33. 272
  34. 287
  35. 480
  36. 249
  37. 481
  38. 380
  39. 327
  40. 531

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