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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 969 · 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. 1.160 + 59 =
  2. 2.444 + 68 =
  3. 3.417 + 18 =
  4. 4.460 + 28 =
  5. 5.457 + 37 =
  6. 6.358 + 27 =
  7. 7.95 + 97 =
  8. 8.29 + 67 =
  9. 9.436 + 59 =
  10. 10.154 + 57 =
  11. 11.405 + 17 =
  12. 12.397 + 39 =
  13. 13.158 + 87 =
  14. 14.71 + 69 =
  15. 15.145 + 79 =
  16. 16.391 + 39 =
  17. 17.325 + 88 =
  18. 18.287 + 58 =
  19. 19.127 + 39 =
  20. 20.364 + 77 =
  21. 21.155 + 17 =
  22. 22.133 + 38 =
  23. 23.366 + 29 =
  24. 24.332 + 27 =
  25. 25.190 + 58 =
  26. 26.493 + 39 =
  27. 27.255 + 39 =
  28. 28.76 + 77 =
  29. 29.499 + 47 =
  30. 30.442 + 58 =
  31. 31.437 + 77 =
  32. 32.162 + 48 =
  33. 33.476 + 97 =
  34. 34.387 + 47 =
  35. 35.495 + 99 =
  36. 36.230 + 88 =
  37. 37.222 + 29 =
  38. 38.146 + 27 =
  39. 39.104 + 17 =
  40. 40.130 + 17 =

Answer key

  1. 219
  2. 512
  3. 435
  4. 488
  5. 494
  6. 385
  7. 192
  8. 96
  9. 495
  10. 211
  11. 422
  12. 436
  13. 245
  14. 140
  15. 224
  16. 430
  17. 413
  18. 345
  19. 166
  20. 441
  21. 172
  22. 171
  23. 395
  24. 359
  25. 248
  26. 532
  27. 294
  28. 153
  29. 546
  30. 500
  31. 514
  32. 210
  33. 573
  34. 434
  35. 594
  36. 318
  37. 251
  38. 173
  39. 121
  40. 147

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