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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 942 · 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. 1.449 + 98 =
  2. 2.417 + 39 =
  3. 3.103 + 28 =
  4. 4.135 + 58 =
  5. 5.140 + 29 =
  6. 6.59 + 17 =
  7. 7.121 + 77 =
  8. 8.485 + 79 =
  9. 9.440 + 79 =
  10. 10.119 + 38 =
  11. 11.79 + 99 =
  12. 12.93 + 59 =
  13. 13.494 + 39 =
  14. 14.50 + 37 =
  15. 15.312 + 79 =
  16. 16.114 + 99 =
  17. 17.84 + 39 =
  18. 18.240 + 37 =
  19. 19.240 + 17 =
  20. 20.368 + 47 =
  21. 21.282 + 89 =
  22. 22.161 + 68 =
  23. 23.402 + 89 =
  24. 24.66 + 17 =
  25. 25.51 + 39 =
  26. 26.126 + 29 =
  27. 27.282 + 27 =
  28. 28.472 + 97 =
  29. 29.296 + 97 =
  30. 30.187 + 78 =
  31. 31.76 + 59 =
  32. 32.350 + 77 =
  33. 33.302 + 97 =
  34. 34.243 + 89 =
  35. 35.452 + 99 =
  36. 36.479 + 89 =
  37. 37.202 + 28 =
  38. 38.316 + 77 =
  39. 39.437 + 88 =
  40. 40.40 + 17 =

Answer key

  1. 547
  2. 456
  3. 131
  4. 193
  5. 169
  6. 76
  7. 198
  8. 564
  9. 519
  10. 157
  11. 178
  12. 152
  13. 533
  14. 87
  15. 391
  16. 213
  17. 123
  18. 277
  19. 257
  20. 415
  21. 371
  22. 229
  23. 491
  24. 83
  25. 90
  26. 155
  27. 309
  28. 569
  29. 393
  30. 265
  31. 135
  32. 427
  33. 399
  34. 332
  35. 551
  36. 568
  37. 230
  38. 393
  39. 525
  40. 57

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