New
New
Year 7

Describing exchange rates with ratio

I can use ratio to describe exchange rates.

New
New
Year 7

Describing exchange rates with ratio

I can use ratio to describe exchange rates.

Lesson details

Key learning points

  1. Double number lines or a straight line graph can be helpful when determining the ratio.
  2. There is more than one way to describe an exchange rate.
  3. An exchange ratio is a practical example of a multiplicative relationship.
  4. An exchange rate can be thought of as converting between different units of money.

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.

Keywords

  • Exchange rate - An exchange rate is the rate at which one currency is exchanged for another.

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 (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Complete the sentence: When using a ratio table you find the relationship.
Correct Answer: multiplicative, multiply, times
Q2.
What number is represented by the question mark in this bar model?
An image in a quiz
Correct Answer: 36, thirty-six, thirty six, thirtysix
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?
Correct Answer: 6, 6 red flowers, six, 6 red
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?
Correct Answer: 270 g, 270 grams, 270g, 270grams, 270
Q5.
Andeep, Sam and Sofia share some sweets in the ratio 3 : 8 : 5. Sam gets 24 sweets, how many does Sofia get?
Correct Answer: 15, 15 sweets, fifteen, fifteen sweets
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?
Correct Answer: 9.6, 9.6 cm, 9.6cm

6 Questions

Q1.
Complete the sentence: The multiplicative relationship between 2 currencies is called the .
Correct Answer: exchange rate, exchange
Q2.
Select the graphs that show a multiplicative relationship.
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
Q3.
Use the graph to convert £55 into dollars ($).
An image in a quiz
Correct Answer: $70, 70$, 70 dollars, 70
Q4.
Use the graph to convert $50 into pounds (£).
An image in a quiz
Correct Answer: £40, 40£, 40 pounds, 40
Q5.
£1 : $1.92. Use this exchange rate to convert £250 into dollars ($).
Correct Answer: $480, 480, 480$, 480 dollars
Q6.
£1 : $1.92. Use this exchange rate to convert $672 into dollars (£).
Correct Answer: £350, 350, 350£, 350 pounds