1. Bell Work Write the ratio in simplest form: 18 24 Write the above simplified ratio two other ways. What is the ratio of boys to girls and girls to boys in this class? 3434 3 to 4 and 3:4

2. Rates A rate is a ratio of two quantities measured in different units.

3. Unit Rate To find the Unit Rate, you would find the cost or amount for 1. Or the rate when the denominator is 1. “How much for just 1?” BACK

4. A unit rate is a rate that has a denominator of 1 unit. The three unit rates are equivalent. 15 mi 1 hr 15 mi/h 15 miles per hour “per” means “for every”

5. If it costs $78 for 13 sandwiches, What is the unit rate? Unit Rate BACK

6. The "Unit Price" (or "unit cost") tells you the cost per liter, per kilogram, per pound, etc, of what you want to buy. Just divide the cost by the quantity. Just divide the cost by the quantity: Example: 2 liters for $3.80 is $3.80/2 liters = $1.90 per liter

7. A store sells the same pasta the following two ways: 10 pounds of bulk pasta for $15.00 2 pounds of packaged pasta for $3.98 Which is the better buy? Find the unit price for both types. Bulk Pasta: $15.00= $1.50 10 lb 1 lb Packaged Pasta: $3.98 = $1.99 2 lb 1 lb The bulk pasta is the better buy because it costs less per pound.

8. What is best? 10 pencils for $4.00 or 6 pencils for $2.70 ? $ 4.00 / 10 = $0.40 per pencil Here is the Unit Cost: $2.70 / 6 = $0.45 per pencil So the lowest Unit Price (and the best bargain) is 10 pencils for $4.00

9. Comparing Comparing Unit Prices can be a good way of finding which is the "best buy". Example: What is best? 2 liters of Milk at $3.80, or 1.5 liters of Milk at $2.70 ? In this case the "Unit" is 1 liter, and the Unit Prices are: $3.80 / 2 liters = $1.90 per liter $2.70 / 1.5 liters = $1.80 per liter So the lowest Unit Price (and the best bargain) is 1.5 liters at $2.70.

10. You buy a package of 6 pairs of athletic socks for $8.94. Write this as a unit rate. $1.49 per pair A bullet train in Japan can travel 186 miles in 2 hours. Write this as a unit rate. 93 mi/h Which is the better buy? Cereal: 17 ounces for $3.40 or 14 ounces for $3.08 17 ounces for $3.40

11. Juice Anyone?? $2.07 48 fl.oz. 0.043125 $0.04 per fl.oz. $1.64 32 fl.oz. 0.05125 $0.05 per fl.oz. The 48 fl.oz. bottle is the better value.

12. Find the Unit Rate Amy can read 88 pages in 4 hours. What is the unit rate? (How many pages can she read per hour?) 88 pages 4 hours 22 pages / hour

13. Rate: 150 heartbeats 2 minutes Unit Rate (How many beats per minute) 150 ÷ 2 = 75 heartbeats per minute.