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Uploaded by r2abraham on Mar 12, 2010
After three preparatory tutorials with marbles, we move onto the soroban in this teaching for parent and child. By Ralph Abraham and Hiroko Tojo of hte Visual Math Institute, www.vismath.org.
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nice tutorial
and thanks for the site link
xLOBDx 2 years ago
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nice tutorial
and thanks for the site link
xLOBDx 2 years ago