Giuseppe's Rate Growing Post

Part 1


Rate: compares 2 quantities measured in DIFFERENT units.


Ratio: compares 2 quantities measured in the SAME unit.


What is the difference between ratio and rate?


RATE is comparing 2 quantities measured in DIFFERENT units while a RATIO compares 2 quantities in the SAME unit.





4. Determine the unit rate in each situation.


a) An orca swims 110 km in 2 h.


55/hour


b) A Canada goose flies 800 km in 12.5 h.


19.3/hour


c) Cathy plants 45 daffodils in 30 min.


1.5/mins.





12. The rate at which glaciers melt is increasing globally. The Saskatchewan Glacier near Banff has receded 1.5 km in the last 75 years. The Peyto Glacier shown below receded 1320 m from 1923 to 1993. Which glacier had the greater annual rate of melting?


Saskatchewan=20m/year


Peyto=19m/year


Saskatchewan Glacier has the greater annual rate of melting.



Part 2


















These are the Grade 8 ingredients for Spaghetti Sauce. This recipe serves 4 people.

1) What would the recipe look like if it had to serve 10 people? Show your calculations.

• ground beef 1.25 lb
• medium onion, diced 2.5
• stalk of celery 2.5
• clove garlic, minced 2.5
• canned tomatoes, chopped 35 oz
• can tomato paste 1.25
• parsley 2.5 tsp
• basil 3.75 tsp
• oregano 2.5
• sugar 2.5
• Worcestershire sauce 1.25
• seasoning salt 1.25
• bay leaf 2.5

2) What would the recipe look like if you had to only serve 1 person? Show your calculations.

• ground beef 0.125 lb
• medium onion, diced 0.25
• stalk of celery 0.25
• clove garlic, minced 0.25
• canned tomatoes, chopped 3.5 oz
• can tomato paste 0.125
• parsley 0.25 tsp
• basil 0.375 tsp
• oregano 0.25 tsp
• sugar 0.25 tsp
• Worcestershire sauce 0.125 tsp
• seasoning salt 0.125 tsp
• bay leaf 0.25