Twelve is the first number with two pairs of factors (2 x 6 and 3 x 4). Primes, on the other hand, have no pairs of factors other than the trivial pair of one and the prime number itself. Considering that contrast, here’s an interesting fact about primes and the number 12. Add 12 to […]
Tag Archives: Problem of the Month
November 2008 Problem of the Month: finding an alternative way to represent a number using nothing more than a few candles. Use number theory and flexible thinking to find a way to show the number. There’s a prize for the person who answers most quickly.
Answer to October’s Problem of the Month, a problem about divisibility by 9.
Here’s the problem — Al’s Discount Clothing store is trying to entice customers with a special “20-40” Percent Sale. Here’s how it works. For all sale items, the Al’s first takes off 20%. Then the store takes an additional 40% off the sale price. Questions: a) How much is the discount, under […]