Percentages By Harris, Draven, And Gaige. What is a percentage and how do I find it?  A percentage is a fraction of a whole number.  To find the percentage.

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Presentation transcript:

Percentages By Harris, Draven, And Gaige

What is a percentage and how do I find it?  A percentage is a fraction of a whole number.  To find the percentage of a whole number you divide the number you do the fraction of that number divided by the whole.  I.E.- If the total number is 35 and I need to find what percentage of 7 is in 35. so I will divide 7 by 35 and get.20. I will move the decimal over twice and get 20%. This means that 7 is 20% of 35.

Application of percentages  The application of percentages is using proportions to solve real world problems involving percentages.  To do this you set up a proportion and cross multiply and you use the variable for taxes, tips, and discounts.

Example 1: App. Of percent's  n/75 x 15/100 cross multiply  100n/100 x 1,125/100  N=11.25

Simple Intrest  Simple interest is a quick method of finding interest on investments and is found by multiplying interest (I) by amount invested (P) by amount of time invested (T) (in this case, years)

Example 2: Simple Interest  R= x P=500 x T=3 =I?  I=67.5

Percent of Increase  Percent of increase is the measurement of how much something gains value.  To find percent of increase you take new amount- original amount/ original amount.

Example 3: Percent of Increase  Population of a city in 1990: 513,117  Population of same city in 2000: 583,845  583,845 – 513, , ,117= …

Percent of Decrease  Percent of decrease is the measurement of how much something loses value.  To find percent of decrease original amount- new amount/ original amount.

Example 4: Percent of Decrease  Ave. score of a team season 1: 74.9  Ave score season 2: 61.6  74.9 – 61.6  74.9  =