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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 890 · 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. 1.249 + 47 =
  2. 2.211 + 19 =
  3. 3.267 + 39 =
  4. 4.341 + 99 =
  5. 5.196 + 87 =
  6. 6.366 + 17 =
  7. 7.44 + 67 =
  8. 8.356 + 19 =
  9. 9.479 + 29 =
  10. 10.53 + 47 =
  11. 11.73 + 99 =
  12. 12.495 + 78 =
  13. 13.186 + 59 =
  14. 14.494 + 59 =
  15. 15.263 + 37 =
  16. 16.60 + 28 =
  17. 17.43 + 89 =
  18. 18.81 + 78 =
  19. 19.210 + 49 =
  20. 20.121 + 37 =
  21. 21.51 + 37 =
  22. 22.352 + 18 =
  23. 23.221 + 88 =
  24. 24.271 + 19 =
  25. 25.189 + 57 =
  26. 26.464 + 69 =
  27. 27.440 + 87 =
  28. 28.195 + 27 =
  29. 29.191 + 59 =
  30. 30.263 + 78 =
  31. 31.395 + 28 =
  32. 32.305 + 59 =
  33. 33.178 + 89 =
  34. 34.372 + 77 =
  35. 35.60 + 97 =
  36. 36.102 + 69 =
  37. 37.254 + 77 =
  38. 38.212 + 69 =
  39. 39.170 + 49 =
  40. 40.94 + 97 =

Answer key

  1. 296
  2. 230
  3. 306
  4. 440
  5. 283
  6. 383
  7. 111
  8. 375
  9. 508
  10. 100
  11. 172
  12. 573
  13. 245
  14. 553
  15. 300
  16. 88
  17. 132
  18. 159
  19. 259
  20. 158
  21. 88
  22. 370
  23. 309
  24. 290
  25. 246
  26. 533
  27. 527
  28. 222
  29. 250
  30. 341
  31. 423
  32. 364
  33. 267
  34. 449
  35. 157
  36. 171
  37. 331
  38. 281
  39. 219
  40. 191

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