Percent Percent DDOOTT.com.comPercent Percent DDOOTT.com.com

Calculating and Using percent in Calculating and Using percent in the Real World the Real World

DOGGONE MATH LYRICSMusic and Lyrics by Harry GuffeeCopyright 2002 Harry Guffee/BMI

PERCENTPercent comes from the Latin words per centumWhich means parts in a hundred, so you seeA penny is one cent out of a hundredA hundred years are in a centuryTo calculate percent of any numberMultiply the number times percentTimes a decimal; times a fractionAs long as they are all equivalentOne percent is one part in a hundredTen percent is also one in tenA centipede is thought to have a hundred legsCenturions control one hundred menPercents can also be expressed as fractionsOne fourth is also twenty-five percentOr twenty-five one hundredthsOr “point twenty-five”As long as they are all equivalent

Look around - % is there

Sales Sales TaxTax

DiscouDiscountnt

There are many uses for percent

Calculating the Calculating the TipTip

Nutritional Nutritional InformationInformation

Finding the Percentage

Freddie sold $160 worth of video games to a friend. He kept 15% of the money for himself and put the rest in the bank. How much did he keep for himself?

To find the percentage of a number

15% of 160

Change the percent to fraction or a decimal

.15 X 160

Multiply

15% of $160 = $24

Need more help?

If you sit in a shopping mall long enough, it is almost a certainty that you will hear someone say, "What is 25% of $60 or what is 40% of $30?"The first step in calculating the percent of numbers is to change the percent to a decimal. When you see the word "of" in word problems, that signals multiplication, so take the decimal and multiply by the number. 

Example: Find 25% of $60. .25 x 60 =$15

By changing the percent to a decimal and translating the word "of" to multiplication we have a simple solution.

Example: Find 40% of $30..40 x 30 = $12

 

We can now discuss sales price and discount.  A suit is regularly priced at $120, and it is marked 20% off the regular price. What is the new price for the suit?Follow the previous examples and begin by taking 20% of $120.

20% of $120 = .20 x 120 = $24.00

We call $24 the discount.

We calculate the sales price by taking the regular price $120 and subtracting the discount $24…$120 – $24 = $96The sales price and cost of the dress is therefore $96.

Addition tutorials can be found at

Pearson Prentice Hall Mathematics Video

School Tube – Finding Percent of a Number

Mathplayground – How to Find Sales Price

(Click percent sign to navigate to internet site)

Can you score 100% ?

What is 25% of 320?

(Click on Answer to display)Answer:Answer: 80

What is 45% of 86?(Click on Answer to display)

Answer:Answer: 38.7

Games http://www.mathplayground.com/balloon_invaders_percent.html

http://www.mathplayground.com/percent_shopping.html

www.mathplayground.com/mathatthemall2html

www.bbc.co.uk/.../fractiondecimal/percentage/

www.kidsmathonline.com/numbers/percentages.html

What percentage of the DOTS are orange?

What percentage of the DOTS are red?What percentage of the DOTS are upside down?

Fun Spot Dots and Percentage

DOTS were introduced in 1940 by Mason and trademarked that year. In 1972, Tootsie Roll Industries acquired the DOTS brand

by purchasing the Mason Division of Candy Corporation of America.

Take a tour of the Tootsie Roll factory to see how the Dots candies are made.

http://www.tootsie.com/gal_tour.php

Fun Spots Dots and percentage

Answer:• 40% of the DOTS are orange.• 60% of the DOTS are red.• 35% of the DOTS are upside down.

Acknowledgements• Music• DOGGONE MATH LYRICS: Music and Lyrics by Harry

Guffee; Copyright 2002 Harry • Guffee/BMI• References:• Pearson Prentice Hall Mathematics• SchoolTube• Schoolplayground.com• Kidsmathonline.com• Last Brain Thinking• Tootsie Roll Industries• Created by C. M. Usauskas 4/2011