MATHCOUNTS Mini: January 2011
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Uploaded by mathcountsfdn on Jan 4, 2011
MATHCOUNTS Mini: January 2011; see a better version at www.mathcounts.org!
- 13 likes, 1 dislikes
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...during the year 2009, I began a little demo & puzzle with the "sum of all ten digits," then I went on to square it (45 x 45 = 2025), then I innocently began showing a series of differences of squares....2025 -1 / -4 / etc....voila...!...2025 - 16 = 45^2 - 4^2 = 2009...yay...!
jwm239 1 month ago
it would seriously help me (Pennsylvania Math Counts State Team and many other children across the united states.
soccerpro620 1 year ago
you should consider doing these videos more often
soccerpro620 1 year ago