Speed grid addition
http://www.primarygames.co.uk/pg2/speedgrid/speedadd/urikares.html Speed grid subtraction level 1 http://www.oswego.org/ocsd-web/games/SpeedGrid/Subtraction/urikasub1res.html level 2 http://www.oswego.org/ocsd-web/games/SpeedGrid/Subtraction/urikasub2res.html level 3 http://www.oswego.org/ocsd-web/games/SpeedGrid/Subtraction/urikasub3res.html
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