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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 892 · 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. 1.366 + 67 =
  2. 2.237 + 48 =
  3. 3.305 + 97 =
  4. 4.453 + 67 =
  5. 5.84 + 59 =
  6. 6.363 + 87 =
  7. 7.244 + 18 =
  8. 8.252 + 48 =
  9. 9.370 + 39 =
  10. 10.330 + 59 =
  11. 11.317 + 38 =
  12. 12.129 + 59 =
  13. 13.36 + 19 =
  14. 14.146 + 19 =
  15. 15.112 + 78 =
  16. 16.127 + 17 =
  17. 17.40 + 37 =
  18. 18.360 + 68 =
  19. 19.89 + 89 =
  20. 20.396 + 57 =
  21. 21.476 + 18 =
  22. 22.46 + 97 =
  23. 23.414 + 57 =
  24. 24.339 + 68 =
  25. 25.154 + 18 =
  26. 26.130 + 67 =
  27. 27.276 + 28 =
  28. 28.103 + 58 =
  29. 29.488 + 67 =
  30. 30.450 + 28 =
  31. 31.407 + 77 =
  32. 32.237 + 69 =
  33. 33.285 + 39 =
  34. 34.288 + 69 =
  35. 35.214 + 89 =
  36. 36.497 + 37 =
  37. 37.431 + 69 =
  38. 38.40 + 27 =
  39. 39.401 + 29 =
  40. 40.321 + 98 =

Answer key

  1. 433
  2. 285
  3. 402
  4. 520
  5. 143
  6. 450
  7. 262
  8. 300
  9. 409
  10. 389
  11. 355
  12. 188
  13. 55
  14. 165
  15. 190
  16. 144
  17. 77
  18. 428
  19. 178
  20. 453
  21. 494
  22. 143
  23. 471
  24. 407
  25. 172
  26. 197
  27. 304
  28. 161
  29. 555
  30. 478
  31. 484
  32. 306
  33. 324
  34. 357
  35. 303
  36. 534
  37. 500
  38. 67
  39. 430
  40. 419

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