Variables are in proportion if they have a constant multiplicative relationship.

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

Checking and securing understanding of scaled drawings

Maths

In the angles unit, pupils reasoned through more complex problems involving angles. In the bearings unit, pupils apply their knowledge of angles in order to calculate bearings and solve angle problems within the context of bearings.

Bearings

Variables are in proportion if they have a {{ }} relationship.

If 1 cm = 20 km, how many kilometres are represented by 6 cm?

If 1 cm = 20 km, how many centimetres represent 60 km?

The scale on a map is 1 : 300 000.  The distance between two places on the map is 4 cm.  What is the distance in real life in kilometres?

The scale on a map is 1 : 400 000.  The distance between two places in real life is 14 km.  What is the distance between them on the map?

The scale of a model building is 1 : 200.  The height of a model church is 6.5 cm.  How tall is the church in real life?

Variables are in proportion if they have a constant {{ }} relationship.

If 1 cm = 5 km, how many kilometres are represented by 6 cm?

If 1 cm = 5 km, how many centimetres represent 45 km?

If 1 cm = 5 km, how many kilometres are represented by 4.5 cm?

This lesson will soon be taken down.

Checking and securing understanding of scaled drawings

Lesson outcome