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I put together a little video of my 4yo daughter and I playing addition memory with the adding-up-to-ten facts (about lesson 40 in level A).

We've been practicing these for a few days now and I thought she was starting to get them by heart, though she was still using the abacus to check every time.  Over the course of our games today, though, she gradually stopped using the abacus and by the end she knows them all cold!

http://www.youtube.com/watch?v=scd353-VXEw