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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 49 · 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. 1.106 + 58 =
  2. 2.381 + 58 =
  3. 3.226 + 97 =
  4. 4.317 + 77 =
  5. 5.452 + 18 =
  6. 6.427 + 48 =
  7. 7.204 + 67 =
  8. 8.31 + 69 =
  9. 9.136 + 47 =
  10. 10.343 + 68 =
  11. 11.374 + 57 =
  12. 12.384 + 89 =
  13. 13.429 + 18 =
  14. 14.330 + 59 =
  15. 15.301 + 47 =
  16. 16.366 + 67 =
  17. 17.57 + 78 =
  18. 18.244 + 77 =
  19. 19.482 + 18 =
  20. 20.164 + 57 =
  21. 21.97 + 67 =
  22. 22.263 + 99 =
  23. 23.440 + 78 =
  24. 24.444 + 37 =
  25. 25.363 + 27 =
  26. 26.338 + 37 =
  27. 27.407 + 29 =
  28. 28.468 + 49 =
  29. 29.117 + 88 =
  30. 30.393 + 87 =
  31. 31.42 + 19 =
  32. 32.372 + 18 =
  33. 33.193 + 69 =
  34. 34.344 + 29 =
  35. 35.447 + 58 =
  36. 36.463 + 67 =
  37. 37.250 + 39 =
  38. 38.402 + 99 =
  39. 39.306 + 28 =
  40. 40.446 + 58 =

Answer key

  1. 164
  2. 439
  3. 323
  4. 394
  5. 470
  6. 475
  7. 271
  8. 100
  9. 183
  10. 411
  11. 431
  12. 473
  13. 447
  14. 389
  15. 348
  16. 433
  17. 135
  18. 321
  19. 500
  20. 221
  21. 164
  22. 362
  23. 518
  24. 481
  25. 390
  26. 375
  27. 436
  28. 517
  29. 205
  30. 480
  31. 61
  32. 390
  33. 262
  34. 373
  35. 505
  36. 530
  37. 289
  38. 501
  39. 334
  40. 504

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