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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 936 · 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. 1.352 + 68 =
  2. 2.90 + 18 =
  3. 3.393 + 78 =
  4. 4.420 + 28 =
  5. 5.399 + 37 =
  6. 6.162 + 98 =
  7. 7.294 + 18 =
  8. 8.485 + 99 =
  9. 9.62 + 39 =
  10. 10.273 + 87 =
  11. 11.483 + 48 =
  12. 12.236 + 17 =
  13. 13.64 + 37 =
  14. 14.373 + 89 =
  15. 15.104 + 19 =
  16. 16.352 + 18 =
  17. 17.258 + 98 =
  18. 18.427 + 98 =
  19. 19.145 + 29 =
  20. 20.287 + 58 =
  21. 21.380 + 49 =
  22. 22.380 + 47 =
  23. 23.55 + 47 =
  24. 24.391 + 38 =
  25. 25.424 + 97 =
  26. 26.33 + 28 =
  27. 27.360 + 79 =
  28. 28.408 + 98 =
  29. 29.220 + 67 =
  30. 30.296 + 37 =
  31. 31.348 + 18 =
  32. 32.160 + 28 =
  33. 33.195 + 19 =
  34. 34.438 + 49 =
  35. 35.36 + 47 =
  36. 36.94 + 19 =
  37. 37.400 + 67 =
  38. 38.269 + 18 =
  39. 39.237 + 79 =
  40. 40.91 + 57 =

Answer key

  1. 420
  2. 108
  3. 471
  4. 448
  5. 436
  6. 260
  7. 312
  8. 584
  9. 101
  10. 360
  11. 531
  12. 253
  13. 101
  14. 462
  15. 123
  16. 370
  17. 356
  18. 525
  19. 174
  20. 345
  21. 429
  22. 427
  23. 102
  24. 429
  25. 521
  26. 61
  27. 439
  28. 506
  29. 287
  30. 333
  31. 366
  32. 188
  33. 214
  34. 487
  35. 83
  36. 113
  37. 467
  38. 287
  39. 316
  40. 148

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