Rates continued

Rates :-)

​Simple

Growth rate
Running rate
Interest rate
Wage or Salary

Multiple Choice

Jack can type 70 words per minute. How many words can he type in 30 minutes?

• 500
• 3500
• 2100
• 1500

Match

Match the following

• 360 km on 30L

• 200km on 12.5L

• 100km on 5.5L

• 423km on 7.9L

12km/L

16km/L

18.18km/L

53.54km/L

• 12km/L

• 16km/L

• 18.18km/L

• 53.54km/L

Comparing Rates

Conversion of units is critical!!!!
Can solve in different ways-
either with "cross multiplying" or unitary method
For example: My car can do 360km on 27L of petrol. How far can it travel on 15.5L?

​For example:

My car can do 360km on 27L of petrol. How far can it travel on 15.5L?

​Rates and tables

Some rates can be in table form- you will need to read the tables carefully.

Rates and crazy units!

Power- is measured in Watts (W)
Energy- is measured in Joules (J)
Electrical Energy - is measured in kilowatt-hour (kWh)
1kWh=3.6J
Consumption is then a rate expressed over time
Energy ratings

Multiple Choice

Convert $15/kg, to $/g

• $0.15/g
• $0.0015/g
• $0.15/kg
• $0.015/g

Multiple Choice

A hose fills a 10L bucket in 20 seconds. What is the flow rate per minute?

• 0.5L/min

• 1L/min

• 10L/min

• 30L/min

Match

Match the following

• 1kWh

• 5kWh

• 500W in 1 hour

• 10W in 1 hour

1000W in 1 hour

5000W in 1 hour

0.5kWh

0.01kWh

• 1000W in 1 hour

• 5000W in 1 hour

• 0.5kWh

• 0.01kWh

Poll

Which is better?

• 100km/7L

• 20km/1.3L

• 150km/8L

Reorder

Reorder the following rates of typing words per minute, from smallest to largest

• 30 words in 5 minutes

• 32 words in 4 minutes

• 45 words in 5 minutes

• 50 words in 5 minutes

• 44 words in 4 minutes

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5