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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 978 · 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. 1.114 + 28 =
  2. 2.373 + 77 =
  3. 3.449 + 99 =
  4. 4.457 + 97 =
  5. 5.53 + 99 =
  6. 6.278 + 19 =
  7. 7.130 + 48 =
  8. 8.466 + 27 =
  9. 9.371 + 28 =
  10. 10.219 + 69 =
  11. 11.421 + 28 =
  12. 12.111 + 19 =
  13. 13.121 + 69 =
  14. 14.366 + 28 =
  15. 15.293 + 57 =
  16. 16.436 + 39 =
  17. 17.71 + 27 =
  18. 18.298 + 99 =
  19. 19.465 + 49 =
  20. 20.413 + 77 =
  21. 21.119 + 49 =
  22. 22.55 + 28 =
  23. 23.219 + 28 =
  24. 24.219 + 87 =
  25. 25.435 + 49 =
  26. 26.45 + 97 =
  27. 27.367 + 57 =
  28. 28.62 + 67 =
  29. 29.173 + 89 =
  30. 30.255 + 57 =
  31. 31.105 + 49 =
  32. 32.415 + 88 =
  33. 33.421 + 57 =
  34. 34.55 + 29 =
  35. 35.128 + 38 =
  36. 36.272 + 47 =
  37. 37.255 + 37 =
  38. 38.97 + 58 =
  39. 39.100 + 27 =
  40. 40.215 + 48 =

Answer key

  1. 142
  2. 450
  3. 548
  4. 554
  5. 152
  6. 297
  7. 178
  8. 493
  9. 399
  10. 288
  11. 449
  12. 130
  13. 190
  14. 394
  15. 350
  16. 475
  17. 98
  18. 397
  19. 514
  20. 490
  21. 168
  22. 83
  23. 247
  24. 306
  25. 484
  26. 142
  27. 424
  28. 129
  29. 262
  30. 312
  31. 154
  32. 503
  33. 478
  34. 84
  35. 166
  36. 319
  37. 292
  38. 155
  39. 127
  40. 263

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