The TI-Nspire document AddingFractions.tns, presents an animation of two user-defined fractions being added together. Move the white point along the slider to gradually "pour" the red-shaded area from the left-hand to the right-hand pot, with an extra pot being added if necessary.
The activity is designed primarily for whole-class teaching using the TI-Nspire Teacher Software projected onto a screen. However, students are also able to produce the animation using the TI-Nspire document on their handhelds.
Detailed teacher notes suggest ways of using it in the classroom.
This activity forms part of the OxBox, published by Oxford University Press to support their course 'Oxford GCSE Maths' http://www.oup.com/oxed/secondary/2010gcse/