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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 980 · 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. 1.460 + 58 =
  2. 2.158 + 38 =
  3. 3.265 + 57 =
  4. 4.269 + 89 =
  5. 5.41 + 18 =
  6. 6.345 + 77 =
  7. 7.240 + 47 =
  8. 8.308 + 69 =
  9. 9.51 + 19 =
  10. 10.183 + 89 =
  11. 11.92 + 67 =
  12. 12.470 + 19 =
  13. 13.495 + 18 =
  14. 14.112 + 18 =
  15. 15.357 + 87 =
  16. 16.344 + 98 =
  17. 17.178 + 37 =
  18. 18.419 + 29 =
  19. 19.424 + 28 =
  20. 20.94 + 48 =
  21. 21.406 + 59 =
  22. 22.348 + 78 =
  23. 23.111 + 78 =
  24. 24.305 + 18 =
  25. 25.293 + 98 =
  26. 26.97 + 59 =
  27. 27.345 + 18 =
  28. 28.398 + 48 =
  29. 29.250 + 58 =
  30. 30.284 + 48 =
  31. 31.29 + 28 =
  32. 32.458 + 79 =
  33. 33.87 + 99 =
  34. 34.293 + 79 =
  35. 35.314 + 39 =
  36. 36.156 + 48 =
  37. 37.466 + 17 =
  38. 38.198 + 69 =
  39. 39.205 + 77 =
  40. 40.61 + 18 =

Answer key

  1. 518
  2. 196
  3. 322
  4. 358
  5. 59
  6. 422
  7. 287
  8. 377
  9. 70
  10. 272
  11. 159
  12. 489
  13. 513
  14. 130
  15. 444
  16. 442
  17. 215
  18. 448
  19. 452
  20. 142
  21. 465
  22. 426
  23. 189
  24. 323
  25. 391
  26. 156
  27. 363
  28. 446
  29. 308
  30. 332
  31. 57
  32. 537
  33. 186
  34. 372
  35. 353
  36. 204
  37. 483
  38. 267
  39. 282
  40. 79

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