December 19, 2012 Please get out a pencil and your notes journal, and clear your desk. Please be ready as soon as the bell rings!!!!

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Presentation transcript:

December 19, 2012 Please get out a pencil and your notes journal, and clear your desk. Please be ready as soon as the bell rings!!!!

Ratio Quiz Bonus Question There are 36 students on the soccer team. The ratio of boys to girls is 2:7. How many boys are on the team?

Unit Rate Unit rate is a ratio comparing something to one of another. – Examples: miles per hour Miles per gallon Dollars per hour Words per minute You find the unit rate by setting up a ratio and dividing by the bottom number in the ratio.

Proportion A proportion is two equivalent ratios. – Example: 2 girls to 3 boys = 6 girls to 9 boys – Example: 9 blue to 7 red =90 blue to 70 red You solve a proportion by figuring out what was done to the top or bottom and find the equivalent ratio(fraction)

Percents A percent means out of 100. (Just a fraction over 100) To determine the fraction, you put the percent over 100, then reduce to simplest form. To convert to a percent from a fraction you form a proportion with the fraction equal to x over 100. Ex: 23% = 23/100 Ex: 2/5 = x/100

Changing from a decimal to a percent 1.Read the decimal. Ex: 0.57 is read as fifty seven hundredths. 2.Write the decimal as a fraction. Ex: fifty seven hundredths is written as 3.Set up the proportion from the fraction to percent. Ex: 4.Solve the proportion. Ex:

Changing from a percent to a decimal 1.Write the percent as a fraction over 100. Ex: 20% = 2.Read the fraction. is read as twenty hundredths. 3.Write the decimal that is the same as what you read. Ex: twenty hundredths is written as 0.20.