Re: Math, apparently simple math?
ladygargoyle wrote:Okay, I really don't know math can someone explain;
What number is one half of one quarter of one tenth of 800, I guessed 10 only cause it says 10th?
The way they taught us in grade school, when you see "of" in a word problem, it means multiply. This should make sense. "Half of a dozen" equals 1/2 times 12, or 6, right?
So, the problem is 1/2 x 1/4 x 1/10 x 800. The thing about multiplication is that it doesn't matter what order you multiply them in. When I did this problem in my head, I started at the end. One tenth of 800 is 80. One fourth of 80 is 20. One half of 20 is 10.
Another way to look at it is that when you multiply fractions, you multiply all the numerators (the top numbers) together, then multiply all the denominators (the bottom numbers), and your answer is the first number divided by the second number. In this case, the numerators are 1, 1, 1, and 800. Multiply them together, and you get 800. The denominators are 2, 4, 10, and 1. (The last number is 1 because 800 equals 800/1.) The product of 2, 4, 10, and 1 is 80. So the answer is 800 divided by 80, which is 10.
I hope this helps?