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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 906 · 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. 1.228 + 49 =
  2. 2.29 + 18 =
  3. 3.36 + 37 =
  4. 4.63 + 18 =
  5. 5.478 + 27 =
  6. 6.55 + 79 =
  7. 7.475 + 68 =
  8. 8.459 + 28 =
  9. 9.226 + 59 =
  10. 10.265 + 89 =
  11. 11.143 + 69 =
  12. 12.185 + 58 =
  13. 13.278 + 88 =
  14. 14.407 + 67 =
  15. 15.417 + 57 =
  16. 16.143 + 48 =
  17. 17.27 + 89 =
  18. 18.462 + 37 =
  19. 19.114 + 99 =
  20. 20.164 + 57 =
  21. 21.362 + 79 =
  22. 22.388 + 57 =
  23. 23.454 + 87 =
  24. 24.141 + 57 =
  25. 25.383 + 37 =
  26. 26.480 + 48 =
  27. 27.146 + 57 =
  28. 28.66 + 57 =
  29. 29.54 + 57 =
  30. 30.25 + 67 =
  31. 31.427 + 27 =
  32. 32.420 + 68 =
  33. 33.417 + 87 =
  34. 34.78 + 47 =
  35. 35.158 + 78 =
  36. 36.347 + 28 =
  37. 37.164 + 37 =
  38. 38.476 + 88 =
  39. 39.129 + 29 =
  40. 40.132 + 88 =

Answer key

  1. 277
  2. 47
  3. 73
  4. 81
  5. 505
  6. 134
  7. 543
  8. 487
  9. 285
  10. 354
  11. 212
  12. 243
  13. 366
  14. 474
  15. 474
  16. 191
  17. 116
  18. 499
  19. 213
  20. 221
  21. 441
  22. 445
  23. 541
  24. 198
  25. 420
  26. 528
  27. 203
  28. 123
  29. 111
  30. 92
  31. 454
  32. 488
  33. 504
  34. 125
  35. 236
  36. 375
  37. 201
  38. 564
  39. 158
  40. 220

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