Here's a video to demonstrate how to use your fingers as calculator to do 6's, 7's, 8's, 9's, and 10's. However, you probably already know your 10's and won't need to use your 'finger calculator'!!
http://www.youtube.com/watch?v=_eFnzNw10Qc&feature=related
Three-fourths of a year!
15 years ago
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