median
don steward
mathematics teaching 10 ~ 16
Sunday, 9 December 2007
powers of 11
ask students to look at the powers of 11 and explore patterns
they might notice:
stemming from noticing that 12 - 1 is 11
to multiply by 11 is reasonably easy
add adjacent digits
(maybe imagining zero either end of the previous number)
equivalent to x 10, +1
what will 11^12 be?
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