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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 860 · 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. 1.491 + 67 =
  2. 2.25 + 29 =
  3. 3.442 + 48 =
  4. 4.206 + 87 =
  5. 5.179 + 48 =
  6. 6.154 + 98 =
  7. 7.223 + 98 =
  8. 8.72 + 97 =
  9. 9.494 + 79 =
  10. 10.115 + 57 =
  11. 11.212 + 17 =
  12. 12.346 + 28 =
  13. 13.498 + 98 =
  14. 14.85 + 79 =
  15. 15.363 + 28 =
  16. 16.488 + 57 =
  17. 17.79 + 27 =
  18. 18.77 + 19 =
  19. 19.253 + 29 =
  20. 20.308 + 98 =
  21. 21.256 + 27 =
  22. 22.315 + 79 =
  23. 23.41 + 77 =
  24. 24.176 + 28 =
  25. 25.361 + 77 =
  26. 26.286 + 27 =
  27. 27.163 + 38 =
  28. 28.151 + 77 =
  29. 29.138 + 27 =
  30. 30.93 + 97 =
  31. 31.180 + 38 =
  32. 32.56 + 17 =
  33. 33.401 + 79 =
  34. 34.269 + 79 =
  35. 35.109 + 27 =
  36. 36.289 + 58 =
  37. 37.288 + 18 =
  38. 38.401 + 29 =
  39. 39.115 + 98 =
  40. 40.304 + 88 =

Answer key

  1. 558
  2. 54
  3. 490
  4. 293
  5. 227
  6. 252
  7. 321
  8. 169
  9. 573
  10. 172
  11. 229
  12. 374
  13. 596
  14. 164
  15. 391
  16. 545
  17. 106
  18. 96
  19. 282
  20. 406
  21. 283
  22. 394
  23. 118
  24. 204
  25. 438
  26. 313
  27. 201
  28. 228
  29. 165
  30. 190
  31. 218
  32. 73
  33. 480
  34. 348
  35. 136
  36. 347
  37. 306
  38. 430
  39. 213
  40. 392

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