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Kelli Rivers

on 30 October 2014

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Transcript of Percentages

Percentage Week
Step 1
Examine your problem

Make sure you know your number. Is it a decimal, fraction, or ratio?
Convert From Decimal to Percentage
To Convert Fraction or Ratio to Percentage
If you want to convert fractions or ratios to percentages (Note: Ratios are fractions but irreducible). first you need to divide divide the top of the fraction by the bottom, then multiply the result by 100 and read off the answer.
Example: 2/3, 2 divided by 3 equals 0.666 which is 66%.

Another Easier Method
Step 1: Find a number you can multiply the bottom of the fraction by to get 100.
Step 2: Multiply both top and bottom of the fraction by that number.
Step 3. Then write down just the top number with the "%" sign.
To Convert a Percentage to Anything
To convert a percentage to a decimal take the percentage number and place decimal point back two places.
Example: 65% equals 0.65
To convert a percentage to fraction or ratio, place the percentage over 100.
Why Do You Need to Know This?
Work Assignment:
Ways to Find Percentages.
Percentages are like fractions. They're only
per cent
because 100 cents equals a dollar. 100% equals a whole.

% is the sign of percent so 100% is really 100 percent.
Kelli Rivers
Can there be a percentage of a percentage?
If a shirt is $18.00 how much will if
this sticker was true?

In a survey 8 people like world history out of 50.What's the percentage of people who like world history and people who don't like world history.

To convert a decimal to a percentage, move the decimal two places to the right. That is your percentage, just add the percent sign. (Rounding may be necessary)
Example: 0.566= 57%
Percentage Problems
In a pizza there are 8 slices, if I eat
2 slices what percentage did I eat?


Google Images
We need to know this because percents, decimals, fractions, and ratios are everywhere. If you go to a store and don't know percentages, how will you know what your percentage is getting taken off the bill? Additionally, if you don't know percentages, how will you know how much money you will get from interest (a percentage of your balance gave to you by the bank)? Percentages are everywhere. We need to know them.
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