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Year 11 - Maths

Combining speeds

Compound measures

Unit Summary

In this unit, pupils explore the multiplicative relationship between different compound meaures and units such as speed, rates of pay, density and pressure.

Lesson Summary

You will learn to combine compound measures, calculating overall speed.

Key Notes

  • Two speeds can be combined to give an overall average speed.
  • Average speed is the total distance travelled divided by the total time taken.

Vocabulary To Learn

  • Speed: Speed is the rate at which something is moving. It is measured as the distance travelled per unit of time.

Common Mistakes To Avoid

  • The average speed is found by adding the speeds and dividing by how many average speeds are given.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

Two speeds can be combined to give an overall average speed. Average speed is the total distance travelled divided by the total time taken.

2. Use this key word in a maths sentence and explain it clearly. 'Speed'

Speed is the rate at which something is moving. It is measured as the distance travelled per unit of time. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: The average speed is found by adding the speeds and dividing by how many average speeds are given. Correction: The common misconception is calculating an average of an average. Show how the answers when calculating the average of the average speeds is not the same as calculating the average speed using the total distance and total time of the average speeds.

More Lessons In This Unit

Browse all guides in the Year 11 Maths guide library.