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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