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Lesson 15 of 17
New
New
- Year 7
Describing exchange rates with ratio
I can use ratio to describe exchange rates.
Lesson details
Key learning points
- Double number lines or a straight line graph can be helpful when determining the ratio.
- There is more than one way to describe an exchange rate.
- An exchange ratio is a practical example of a multiplicative relationship.
- An exchange rate can be thought of as converting between different units of money.
Keywords
Exchange rate - An exchange rate is the rate at which one currency is exchanged for another.
Common misconception
Using multiplication as repeated addition leads to incorrect additive strategies of ratios.
Focus on the multiplicative relationships between parts to whole or whole to parts.
Pupils can research the cost of the same items in different countries and convert all of the prices to compare. You could pose the question, 'Is the USA always cheaper?'. Stress the need to compare like for like.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Complete the sentence: When using a ratio table you find the relationship.
Complete the sentence: When using a ratio table you find the relationship.
Q2.What number is represented by the question mark in this bar model?
What number is represented by the question mark in this bar model?
Q3.A bunch of flowers contains red and yellow flowers in the ratio 3 : 5. There are 10 yellow flowers. How many red flowers are in the bunch?
A bunch of flowers contains red and yellow flowers in the ratio 3 : 5. There are 10 yellow flowers. How many red flowers are in the bunch?
Q4.The ratio of flour to butter to sugar in a cookie recipe is 3 : 2 : 1. You use 180g of butter. How much flour is used?
The ratio of flour to butter to sugar in a cookie recipe is 3 : 2 : 1. You use 180g of butter. How much flour is used?
Q5.Andeep, Sam and Sofia share some sweets in the ratio 3 : 8 : 5. Sam gets 24 sweets, how many does Sofia get?
Andeep, Sam and Sofia share some sweets in the ratio 3 : 8 : 5. Sam gets 24 sweets, how many does Sofia get?
Q6.The lengths of the sides of a triangle are split in the ratio 3 : 8 : 7. The shortest side is 3.6 cm, what is the length of the longest side?
The lengths of the sides of a triangle are split in the ratio 3 : 8 : 7. The shortest side is 3.6 cm, what is the length of the longest side?
Assessment exit quiz
6 Questions
Q1.Complete the sentence: The multiplicative relationship between 2 currencies is called the .
Complete the sentence: The multiplicative relationship between 2 currencies is called the .
Q2.Select the graphs that show a multiplicative relationship.
Select the graphs that show a multiplicative relationship.
Q3.Use the graph to convert £55 into dollars ($).
Use the graph to convert £55 into dollars ($).
Q4.Use the graph to convert $50 into pounds (£).
Use the graph to convert $50 into pounds (£).
Q5.£1 : $1.92. Use this exchange rate to convert £250 into dollars ($).
£1 : $1.92. Use this exchange rate to convert £250 into dollars ($).
Q6.£1 : $1.92. Use this exchange rate to convert $672 into dollars (£).
£1 : $1.92. Use this exchange rate to convert $672 into dollars (£).
