"A mind is a fire to be kindled, not a vessel to be filled." -- Plutarch
Math 4
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Facts about 4
4 is even
The factors of 4 are 1,2, and 4.
4 is known as a perfect square because
it is the product of a number times itself 4 = 2x2
4 is the only positive number that is
both the sum and the product of the same two integers:
4= 2+2 and 4= 2x2
4 is the only number in the English language for which
the number of letters in its name is equal to the number itself
A 4 by 4 square has an area equal to its perimeter.
4 is the smallest number of colors
sufficient to color all flat maps
with no adjoining countries sharing the same color.
If you multiply the number 21978 by 4, it turns backwards!
Pick any whole number.
If the number is even, divide it by 2;
if it is odd, multiply it by 3, then add 1.
By repeating this procedure,
sooner or later you'll arrive at the number 4,
which will give you 2, which in turn gives you 1,
and then get a 4 again!
No matter what number you choose,
you'll always arrive at the 4-2-1 cycle.
Learn facts about your favorite number at these websites:
Zoo of Numbers
Number Gossip