Upload
shavonne-jennings
View
214
Download
0
Embed Size (px)
DESCRIPTION
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.
Citation preview
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.