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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 845 · 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. 1.38 + 69 =
  2. 2.44 + 48 =
  3. 3.255 + 78 =
  4. 4.300 + 17 =
  5. 5.123 + 89 =
  6. 6.29 + 37 =
  7. 7.320 + 47 =
  8. 8.460 + 58 =
  9. 9.261 + 59 =
  10. 10.83 + 37 =
  11. 11.119 + 29 =
  12. 12.393 + 67 =
  13. 13.476 + 19 =
  14. 14.236 + 18 =
  15. 15.84 + 58 =
  16. 16.351 + 58 =
  17. 17.97 + 98 =
  18. 18.137 + 19 =
  19. 19.31 + 78 =
  20. 20.442 + 28 =
  21. 21.476 + 68 =
  22. 22.259 + 38 =
  23. 23.79 + 17 =
  24. 24.286 + 29 =
  25. 25.391 + 87 =
  26. 26.97 + 58 =
  27. 27.215 + 99 =
  28. 28.271 + 18 =
  29. 29.270 + 87 =
  30. 30.367 + 78 =
  31. 31.333 + 18 =
  32. 32.85 + 48 =
  33. 33.60 + 58 =
  34. 34.194 + 49 =
  35. 35.328 + 67 =
  36. 36.25 + 58 =
  37. 37.167 + 69 =
  38. 38.101 + 57 =
  39. 39.395 + 37 =
  40. 40.80 + 58 =

Answer key

  1. 107
  2. 92
  3. 333
  4. 317
  5. 212
  6. 66
  7. 367
  8. 518
  9. 320
  10. 120
  11. 148
  12. 460
  13. 495
  14. 254
  15. 142
  16. 409
  17. 195
  18. 156
  19. 109
  20. 470
  21. 544
  22. 297
  23. 96
  24. 315
  25. 478
  26. 155
  27. 314
  28. 289
  29. 357
  30. 445
  31. 351
  32. 133
  33. 118
  34. 243
  35. 395
  36. 83
  37. 236
  38. 158
  39. 432
  40. 138

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