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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 872 · 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. 1.46 + 77 =
  2. 2.193 + 87 =
  3. 3.484 + 98 =
  4. 4.45 + 19 =
  5. 5.363 + 29 =
  6. 6.242 + 57 =
  7. 7.51 + 37 =
  8. 8.391 + 58 =
  9. 9.442 + 28 =
  10. 10.162 + 57 =
  11. 11.394 + 99 =
  12. 12.402 + 79 =
  13. 13.81 + 39 =
  14. 14.80 + 17 =
  15. 15.382 + 68 =
  16. 16.458 + 37 =
  17. 17.221 + 79 =
  18. 18.162 + 27 =
  19. 19.34 + 18 =
  20. 20.62 + 27 =
  21. 21.174 + 49 =
  22. 22.348 + 68 =
  23. 23.356 + 87 =
  24. 24.470 + 49 =
  25. 25.168 + 59 =
  26. 26.232 + 79 =
  27. 27.306 + 67 =
  28. 28.206 + 57 =
  29. 29.272 + 78 =
  30. 30.333 + 27 =
  31. 31.392 + 38 =
  32. 32.321 + 59 =
  33. 33.426 + 69 =
  34. 34.117 + 69 =
  35. 35.172 + 98 =
  36. 36.334 + 89 =
  37. 37.467 + 79 =
  38. 38.424 + 18 =
  39. 39.290 + 28 =
  40. 40.360 + 57 =

Answer key

  1. 123
  2. 280
  3. 582
  4. 64
  5. 392
  6. 299
  7. 88
  8. 449
  9. 470
  10. 219
  11. 493
  12. 481
  13. 120
  14. 97
  15. 450
  16. 495
  17. 300
  18. 189
  19. 52
  20. 89
  21. 223
  22. 416
  23. 443
  24. 519
  25. 227
  26. 311
  27. 373
  28. 263
  29. 350
  30. 360
  31. 430
  32. 380
  33. 495
  34. 186
  35. 270
  36. 423
  37. 546
  38. 442
  39. 318
  40. 417

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