Reduce the following ratios:

18 to 21

12 : 32

9 to 24

5

35

Total number of students in class:______________

Total number of boys:______ Total number of girls:________

Students wearing glasses: _______

Total number of students with blonde hair:___ brown:___ blk:___red:___

Number of students born in AZ:______

 

Unit Rate - a ratio that has a denominator of one.

Examples: cost for one pound

pages read in one hour

cups that can fit on one shelf

Write the unit rate:

$30 for six books

____ for one book

Write the unit rate:

Read 80 pages in 2 hours

_______ pages in one hour

Write the unit rate:

50 books on 2 shelves

Write the unit rate:

24 points in 3 games

Write the unit rate:

A 17 minute telephone call from Boston to Chicago costs $2.38.

What is the cost per minute?

Better Buy - The CHEAPER of the two unit rates…(the lowest amount).

Example: 2 cokes for $1.00 ($.50 each)

4 cokes for $1.75 ($.44 each)

4 cokes for $1.75 is cheaper so it is the better buy.

Find the better buy:

• $ 80 for 5 calculators

• $264 for 24 calculators

Find the better buy:

• $6.20 for 20 liters

• $8.75 for 25 liters

Find the better buy:

• 7 pounds for $12.67

• $21.69 for 9 pounds

Find the better buy:

• $5.10 for 34 pens

• $3.06 for 18 pens

Find the better buy:

• $ 442 for 26 staplers

• $38 for 2 staplers

Find the better buy:

An eight ounce can of tomatoes costs $1.14. A twelve ounce can costs $1.75. Which can of tomatoes has the better unit price?

Find the better buy:

Sam bought 36 calendars for $540. Tara bought 7 calendars for $91. Who got the better buy?

Find the better buy:

Mrs. Riaz needs to buy some meat to make spaghetti. Should she buy 3 pounds for $8.43 or $10.28 for 4 pounds of meat?

Find the better buy:

Rita is buying coffee for a party. She could buy 7 pounds for $12.67 or 9 pounds for $17.46. Which one is the better buy?