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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 946 · 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. 1.154 + 89 =
  2. 2.409 + 57 =
  3. 3.405 + 69 =
  4. 4.144 + 17 =
  5. 5.268 + 59 =
  6. 6.435 + 89 =
  7. 7.329 + 37 =
  8. 8.273 + 27 =
  9. 9.323 + 27 =
  10. 10.330 + 28 =
  11. 11.444 + 58 =
  12. 12.173 + 27 =
  13. 13.195 + 57 =
  14. 14.417 + 27 =
  15. 15.289 + 89 =
  16. 16.440 + 57 =
  17. 17.74 + 77 =
  18. 18.101 + 28 =
  19. 19.106 + 38 =
  20. 20.304 + 59 =
  21. 21.116 + 18 =
  22. 22.417 + 27 =
  23. 23.101 + 58 =
  24. 24.442 + 98 =
  25. 25.245 + 67 =
  26. 26.38 + 47 =
  27. 27.186 + 69 =
  28. 28.424 + 48 =
  29. 29.182 + 18 =
  30. 30.428 + 68 =
  31. 31.106 + 47 =
  32. 32.56 + 37 =
  33. 33.272 + 57 =
  34. 34.275 + 39 =
  35. 35.452 + 87 =
  36. 36.431 + 57 =
  37. 37.273 + 49 =
  38. 38.195 + 49 =
  39. 39.211 + 37 =
  40. 40.65 + 79 =

Answer key

  1. 243
  2. 466
  3. 474
  4. 161
  5. 327
  6. 524
  7. 366
  8. 300
  9. 350
  10. 358
  11. 502
  12. 200
  13. 252
  14. 444
  15. 378
  16. 497
  17. 151
  18. 129
  19. 144
  20. 363
  21. 134
  22. 444
  23. 159
  24. 540
  25. 312
  26. 85
  27. 255
  28. 472
  29. 200
  30. 496
  31. 153
  32. 93
  33. 329
  34. 314
  35. 539
  36. 488
  37. 322
  38. 244
  39. 248
  40. 144

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