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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 4 · 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. 1.398 + 58 =
  2. 2.381 + 89 =
  3. 3.154 + 59 =
  4. 4.268 + 67 =
  5. 5.346 + 57 =
  6. 6.325 + 59 =
  7. 7.262 + 19 =
  8. 8.114 + 58 =
  9. 9.255 + 58 =
  10. 10.66 + 28 =
  11. 11.416 + 87 =
  12. 12.486 + 88 =
  13. 13.443 + 58 =
  14. 14.410 + 77 =
  15. 15.460 + 77 =
  16. 16.392 + 27 =
  17. 17.47 + 97 =
  18. 18.132 + 57 =
  19. 19.460 + 79 =
  20. 20.173 + 97 =
  21. 21.446 + 38 =
  22. 22.366 + 37 =
  23. 23.93 + 79 =
  24. 24.320 + 67 =
  25. 25.258 + 69 =
  26. 26.113 + 78 =
  27. 27.473 + 37 =
  28. 28.413 + 49 =
  29. 29.469 + 47 =
  30. 30.269 + 67 =
  31. 31.280 + 47 =
  32. 32.102 + 68 =
  33. 33.151 + 77 =
  34. 34.392 + 29 =
  35. 35.434 + 49 =
  36. 36.257 + 37 =
  37. 37.318 + 57 =
  38. 38.267 + 69 =
  39. 39.417 + 67 =
  40. 40.479 + 58 =

Answer key

  1. 456
  2. 470
  3. 213
  4. 335
  5. 403
  6. 384
  7. 281
  8. 172
  9. 313
  10. 94
  11. 503
  12. 574
  13. 501
  14. 487
  15. 537
  16. 419
  17. 144
  18. 189
  19. 539
  20. 270
  21. 484
  22. 403
  23. 172
  24. 387
  25. 327
  26. 191
  27. 510
  28. 462
  29. 516
  30. 336
  31. 327
  32. 170
  33. 228
  34. 421
  35. 483
  36. 294
  37. 375
  38. 336
  39. 484
  40. 537

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