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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 955 · 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. 1.299 + 68 =
  2. 2.68 + 77 =
  3. 3.455 + 67 =
  4. 4.36 + 99 =
  5. 5.110 + 79 =
  6. 6.107 + 89 =
  7. 7.366 + 58 =
  8. 8.469 + 17 =
  9. 9.58 + 37 =
  10. 10.279 + 78 =
  11. 11.463 + 27 =
  12. 12.473 + 47 =
  13. 13.452 + 87 =
  14. 14.81 + 47 =
  15. 15.228 + 47 =
  16. 16.116 + 49 =
  17. 17.46 + 98 =
  18. 18.196 + 37 =
  19. 19.343 + 57 =
  20. 20.179 + 27 =
  21. 21.479 + 49 =
  22. 22.257 + 68 =
  23. 23.220 + 47 =
  24. 24.359 + 49 =
  25. 25.269 + 99 =
  26. 26.89 + 47 =
  27. 27.128 + 98 =
  28. 28.48 + 77 =
  29. 29.240 + 67 =
  30. 30.282 + 67 =
  31. 31.357 + 87 =
  32. 32.131 + 57 =
  33. 33.379 + 27 =
  34. 34.468 + 28 =
  35. 35.455 + 77 =
  36. 36.132 + 48 =
  37. 37.142 + 97 =
  38. 38.157 + 77 =
  39. 39.29 + 38 =
  40. 40.117 + 29 =

Answer key

  1. 367
  2. 145
  3. 522
  4. 135
  5. 189
  6. 196
  7. 424
  8. 486
  9. 95
  10. 357
  11. 490
  12. 520
  13. 539
  14. 128
  15. 275
  16. 165
  17. 144
  18. 233
  19. 400
  20. 206
  21. 528
  22. 325
  23. 267
  24. 408
  25. 368
  26. 136
  27. 226
  28. 125
  29. 307
  30. 349
  31. 444
  32. 188
  33. 406
  34. 496
  35. 532
  36. 180
  37. 239
  38. 234
  39. 67
  40. 146

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