means when variables are in proportion if they have a constant multiplicative relationship.

shows the relative sizes of 2 or more values and allows you to compare a part with another part in a whole.

shows us how many equal parts in a whole.

Expressing multiplicative relationships as ratios and fractions

Maths

The multiplicative relationship is extended in the future unit by considering percentages and the connections between multiplicative relationships and direct proportion. By building on a secure understanding of fractions and ratio, pupils can see their understanding of multiplicative relationships being extended.

In the prior unit, pupils generalised and developed their fluency of multiplying with fractions. In this unit, this understanding is extended to ratio and connections between ratios and fractions are explored.

Understanding multiplicative relationships: fractions and ratio

For every 1 t-shirt, there is 1 pair of shorts.

For every 1 t-shirt, there are 2 pairs of shorts.

Number of pairs of shorts × 1 = Number of t-shirts

Number of pairs of shorts × 0.5 = Number of t-shirts

Number of houses $$\times \frac{3}{4}=$$ Number of phones

Number of phones $$\times \frac{3}{4}=$$ Number of houses

Number of phones $$\times \frac{4}{3}=$$ Number of houses

A quantity is divided into two parts: A and B. Match each ratio with the correct fraction.

A quantity is divided into two parts: A and B. Match each ratio with the correct formula.

A quantity is divided into two parts: A and B. Match each fraction with the correct formula to find B.

If two things are proportional then the ratio of part to whole is maintained and the __________ relationship between parts is also maintained.

The ratio table shows a recipe for a  pizza topping sauce. Complete this statement: Pizza sauce $$\times$$ {{ }} = Puree.

The ratio table shows a recipe for a  pizza topping sauce. Complete this statement:  Garlic $$\times$$ {{ }} = Puree.

A bowl of fruit contains apples and bananas. For every 3 apples, there are 5 bananas. There are 15 apples in the bowl. There are {{}} bananas in the bowl. 

A box of fruit contains apples and bananas. For every 3 apples, there are 5 bananas. There are 80 pieces of fruit in total. How many bananas are there? {{ }} bananas.

"For every 9 circles there are 14 squares."

"For every 9 circles there are 15 squares."

"For every 36 circles there are 60 squares."

"For every 1.5 circles there are 2.5 squares."

"For every 1 circle there are 1.5 squares."

Which are equivalent ratios to: "For every 3 circles there are 5 squares."

This lesson will soon be taken down.

Expressing multiplicative relationships as ratios and fractions

Lesson outcome