don steward
mathematics teaching 10 ~ 16

Wednesday, 20 April 2011

prime sums

(1)  what is the total of the first nine prime numbers?

(2)  the primes bigger than 5 and less than 90 are put into threes and each of the totals of these trios are found
then these totals are reversed
what is the total of  (a) the original trios  (b) the reversals?

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