 Definition – a comparison of two or more quantities measured in the same units. › The units are not written › Expressed with a (: ) or (/) › Read at “to”

 Jenny has a bag with 3 DVD’s, 4 marbles, 7 books, and 1 orange. a) What is the ratio of books to marbles? b) What is the ratio of marbles to oranges? c) What is the ratio of DVD’s to the total number of items in the bag? d) What is the ratio of books to marbles to DVD’s to oranges?

 Write two ratios equal to the following ratios. a) 4:7:3 b) 0.4:8.2 c) 1/4 : 1/8

 Write each ratio in lowest terms. a) 65:125 b) 1.9:0.91 c) 5/3: 3/4: 6/2

 Step 1: Find the total number of parts.  Step 2: Find the amount per part.  Step 3: Find each individual amount.

 Sand, gravel and cement are mixed in a ratio of 5:10:3 to make concrete. If 36m of concrete are needed, how much sand, gravel and cement are required?

 Step 1: Find the total number of parts = 18  Step 2: Find the amount per part. 36m/18 parts = 2 m/part  Step 3: Find each individual amount. Sand: 5 parts x 2 m/part = 10 m Gravel: 10 parts x 2 m/part = 20 m Cement: 3 parts x 2 m/part = 6 m Therefore, 10m of sand, 20m of gravel and 6m of cement are required.

 Lisa, Bart and Maggie are partners in a company in which they share all profits and losses in a ratio of 5:3:2. In one year, the profits were $ What is each partner’s share of the profit?

 Lawn fertilizer contains nitrogen, potash, phosphate and filler in a ratio of 29:4:3:64? How much is needed of each for a 6kg bag?