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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 977 · 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. 1.117 + 19 =
  2. 2.396 + 99 =
  3. 3.100 + 37 =
  4. 4.245 + 29 =
  5. 5.386 + 77 =
  6. 6.170 + 38 =
  7. 7.358 + 27 =
  8. 8.429 + 98 =
  9. 9.335 + 49 =
  10. 10.372 + 69 =
  11. 11.181 + 37 =
  12. 12.326 + 77 =
  13. 13.161 + 19 =
  14. 14.60 + 28 =
  15. 15.432 + 18 =
  16. 16.318 + 78 =
  17. 17.319 + 77 =
  18. 18.102 + 59 =
  19. 19.168 + 78 =
  20. 20.79 + 48 =
  21. 21.148 + 57 =
  22. 22.251 + 37 =
  23. 23.47 + 48 =
  24. 24.75 + 89 =
  25. 25.322 + 17 =
  26. 26.123 + 69 =
  27. 27.457 + 17 =
  28. 28.167 + 47 =
  29. 29.113 + 48 =
  30. 30.378 + 59 =
  31. 31.54 + 29 =
  32. 32.420 + 29 =
  33. 33.68 + 88 =
  34. 34.447 + 99 =
  35. 35.96 + 37 =
  36. 36.362 + 29 =
  37. 37.336 + 39 =
  38. 38.96 + 89 =
  39. 39.285 + 97 =
  40. 40.324 + 58 =

Answer key

  1. 136
  2. 495
  3. 137
  4. 274
  5. 463
  6. 208
  7. 385
  8. 527
  9. 384
  10. 441
  11. 218
  12. 403
  13. 180
  14. 88
  15. 450
  16. 396
  17. 396
  18. 161
  19. 246
  20. 127
  21. 205
  22. 288
  23. 95
  24. 164
  25. 339
  26. 192
  27. 474
  28. 214
  29. 161
  30. 437
  31. 83
  32. 449
  33. 156
  34. 546
  35. 133
  36. 391
  37. 375
  38. 185
  39. 382
  40. 382

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