Understanding Rates

Which one is NOT a rate?

• 80 km/hour

• increase from 120 km to 500 km

• 5 litres/minute

• $28/kg

Which are the most likely units for this rate: 'the cost of buying land'

• cents / m²

• $ / km²

• cents / km²

• $ / m²

Which are the most likely units for this rate: 'a persons typing speed'

• words/ minute

• letters / second

• words / second

• letters / minute

An athletes heart beats 250 beats in 5 minutes.

This means that the average heart rate is

_______ beats per minute.

A truck travels 560 km in 7 hours.

This means that the average speed is

_______ km per hour.

It costs $21.06 to buy a 5.4 m length of timber.

This means that the average length costs

_______ $ per metre.

There were 660 ml of rain during the month of November.

This means that the average rainfall was

_______ ml per day.

In the 2000 Sydney Olympics, Cathy Freeman won Gold in the 400m race.

Her time was 49.11 seconds.

This means that her average speed was

_______ m per second (ROUND TO 1 D.P.)

Noah has grown from 1.12 m at 5 years old to 1.41 m at 7 years old. His growth rate in cm per year is

• 0.29 cm / year

• 2.9 cm / year

• 29 cm / year

• -0.29 cm / year

Kane cycles 50 km in 108 minutes. Archie finishes a 42 km cycling race in 90 minutes.

Who is the fastest cyclist?