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Visual: Converting a Fractional Percent to a Fraction 

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Visual: Converting a Fractional Percent to a Fraction 

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Rule to Rounding Percentages : Elementary Math

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Subscribe Now: http://www.youtube.com/subscription_center?add_user=ehow Watch More: http://www.youtube.com/ehow Rounding percentages is easy, so long as you can successfully teach the easy rules that one must follow. Find out about the rule to rounding percentages with help from a mathematics educator in this free video clip.

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Practice: Converting Percents to Decimals

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Practice: Converting Percents to Decimals

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Practice expressing a percent like 12.3% as a decimal.

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Practice: Converting Fractions to Decimals

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Practice: Converting Fractions to Decimals

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Rewriting decimals as fractions

Rewriting decimals as fractions

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Converting fractions to decimals (practice) | Khan Academy

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Take a look at the pizza tiles for related formulas.

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"Cent" should make you think of two things -- pennies and centuries. What do these things have to do with percents?

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"Per" is just another word for "each."

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So if a penny is a part of a dollar, and a year is a part of a century, then "percent" just means.....

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...it means, if you divided the whole shebang were divided into 100 pieces, a percent is a portion of the whole shebang that is less than 100.

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How do you solve for "The whole shebang"?
Base=Portion/Rate
The whole pizza = ~50 sq. inches/ 25%
Go on - work it out.

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Another explanation of word problems with percentages

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Another explanation of word problems with percentages

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http://www.purplemath.com/modules/percntof.htm

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If I know that this is 25% of a 200 square inch pizza, then I can figure out how many square inches this slice is.
Portion = base X rate
200 x 25% = the size of this portion.

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If we cut this 200 square inch pizza into 100 slices, how many slices would make up 50 square inches of it?
Solution: divide the portion by the base:
Rate=portion/base
50 sq. in. /200 sq. in. = the percent of the pizza you're going to have.

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https://www.youtube.com/watch?v=RvtdJnYFNhc&index=30&list=PL301908982CBFE20D

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https://www.youtube.com/watch?v=Gn2pdkvdbGQ&list=PL301908982CBFE20D&index=29