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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 944 · 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. 1.156 + 19 =
  2. 2.196 + 77 =
  3. 3.124 + 99 =
  4. 4.377 + 99 =
  5. 5.461 + 67 =
  6. 6.259 + 27 =
  7. 7.237 + 49 =
  8. 8.496 + 89 =
  9. 9.395 + 79 =
  10. 10.422 + 99 =
  11. 11.273 + 77 =
  12. 12.192 + 27 =
  13. 13.32 + 28 =
  14. 14.103 + 69 =
  15. 15.498 + 49 =
  16. 16.175 + 49 =
  17. 17.273 + 27 =
  18. 18.104 + 28 =
  19. 19.250 + 57 =
  20. 20.60 + 48 =
  21. 21.411 + 47 =
  22. 22.400 + 29 =
  23. 23.107 + 37 =
  24. 24.427 + 88 =
  25. 25.415 + 97 =
  26. 26.205 + 67 =
  27. 27.359 + 58 =
  28. 28.375 + 58 =
  29. 29.356 + 68 =
  30. 30.289 + 18 =
  31. 31.414 + 27 =
  32. 32.237 + 27 =
  33. 33.286 + 47 =
  34. 34.88 + 47 =
  35. 35.231 + 69 =
  36. 36.248 + 57 =
  37. 37.245 + 37 =
  38. 38.403 + 57 =
  39. 39.482 + 27 =
  40. 40.476 + 48 =

Answer key

  1. 175
  2. 273
  3. 223
  4. 476
  5. 528
  6. 286
  7. 286
  8. 585
  9. 474
  10. 521
  11. 350
  12. 219
  13. 60
  14. 172
  15. 547
  16. 224
  17. 300
  18. 132
  19. 307
  20. 108
  21. 458
  22. 429
  23. 144
  24. 515
  25. 512
  26. 272
  27. 417
  28. 433
  29. 424
  30. 307
  31. 441
  32. 264
  33. 333
  34. 135
  35. 300
  36. 305
  37. 282
  38. 460
  39. 509
  40. 524

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