Fraction Estimation
This was inspired by the excellent sketches from David Cox and Dan Pearcy on fraction multiplication and addition. Be sure to try them!
David's fraction addition http://www.geogebratube.org/material/show/id/21313
and his fraction multiplication: http://www.geogebratube.org/material/show/id/21396
Dan's fraction addition http://www.geogebratube.org/material/show/id/21639
The sketch shows you a fraction and 3 part-whole comparisons.
Which is closest to the real fraction?