What is the product of 21% and some number?

1 Answer
Ken C.
Sep 29, 2015

.21x, where x is some number.

Explanation:

The first step is figuring out what 21% is as a number. Well, 21% means 21 parts out of a 100 - which can be expressed as the fraction 21/100. We could leave it like this, but decimals are easier on the eyes than fractions. To convert 21/100 to a decimal, all we do is divide, getting .21.

Next, we interpret "the product of 21% and some number". What is some number? The answer is in the question! Some number is any number - a decimal, fraction, number, square root, etc, etc. To represent "some number" in math terms, we use a letter called a variable. This variable just stands for some number - it can be anything you want it to be. Usually, variables are something like n, x, and y. We'll use x because that's the most common one.

Now, what does "product" mean? Multiplication! It's that easy. So the product of 21% (.21) and some number (x) is .21 multiplied by x, or .21x.

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