You can model percent with a 100 square grid. Click
on the grey/red squares to increase/decrease the percent!! Remember
a percent (%) can be written as fraction with a denominator of 100.

Percent

23 : 100 = 23%

32/100 = 32%

a ratio whose second term is 100. Percent means "parts
per hundred". We use the symbol /100 or % for percent.

Converting Fractions to Percent

3/4 = 75/100 = 75%

2/5 = 40/100 = 40%

3/10 = 30/100 = 30%

9/20 = 45/100 = 45%

use equivalent fractions, if the denominator is a factor of
100.

Make sure there is at least two decimal places. Move
the decimal to the end of the hundredth digit and then place this number over 100.
Reduce to lowest terms.

If there are more than two decimal places, then move the decimal
to the end of the last digit, then place the number over the following denominators:

You can use the following to answer several types of percent problems.
The format for word problems is often:

Click a "Calculate" button to solve each of the
following. Change the numbers in the question to study the pattern. We will
examine two methods to solve each type of problem in the next section.

What %of (number)is what?

Let's examine two methods of solving this type of word problem.

Method 1:

_% x of = is

Method 2:

%/100
= is/of =
i/o

cross-multiply to solve:

% x of = 100
x is

There are 3 types of word problem you will encounter. We can apply
both methods shown to solve these problems. Study the samples below to learn both
methods.

Click on the squares to add and subtract them from the grid with 100
squares.. The numerator of the fraction, when the denominator is 100 represents
percent.