One of our wonderful SEIAs made these Sports Abacuses (Abaci?) for use with our kids who work for rewards. I managed to procure one to try with my artic kids who are able to self monitor. They can move a bead for every correct production and they love to move the beads up and down (and, frankly, so do I - take one of these to your next boring conference or meeting). The 2 minute video shows Chris making a 5 bead abacus, but 10 or even 15 work just as well. I use the 10'er pictured in the opening photo.
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