A comparison of two related quantities.

Often written "this **per** that" but there are many possibilities, including a single number calculated using division.

Example: Sam makes 3 pancakes every 6 minutes, that is a rate of:

• 3 pancakes per 6 minutes

• 0.5 pancakes per minute

• 30 pancakes per hour

• an hourly rate of 30

• etc

Example: 200 sausages were eaten by 50 people. that is:

• 200 sausages per 50 people

• 100 sausages per 25 people

• 4 sausages per person

Example: Alex invested $100 for a month and made $3

• the interest rate is 3/100 = 3% per month

When we compare to a single unit quantity we call it a Unit Rate.

See: Unit Rate