See it
Rate graph
Amount per unit of time.
1
Three Quantities
Rate = Total ÷ Number of units. Total = Rate × Number. Number = Total ÷ Rate.
2
Same Units
Match the units. If the rate is 'per hour', time must be in hours.
3
Rate is NOT Speed
P5 rate is about $/hour, litres/minute, pages/day. No distance-time speed at P5.
Common Mistakes
- Mixing minutes with 'per hour' rate
- Confusing rate with ratio
- Treating rate questions as speed questions
Teaching Team Tip
Write the rate as a fraction with units: e.g. $12 / 1 hour. It removes confusion.
Worked Example
Try it, then check the steps
Question
A tap fills a tank at 8 litres per minute. How much water in 15 minutes?
Steps
- 1Total = Rate × Number
- 2= 8 × 15
- 3= 120 litres
What to do next
Learn Rate
Everything in the library for this topic