When a comparison is made, we are determining how different two objects are. In this case, how many times longer, taller or deeper an object is than another.

A comparison can also be made between an object at the start of, and then after, a change. Examples of change include a change in height of a flower due to growth.

Solve comparison and change problems using multiplication

Maths

Compare and describe lengths using knowledge of multiplication

Compare and describe lengths using knowledge of division

Solve comparison and change problems using division

Solve problems involving comparison and change

Compare and describe measurements involving mass and capacity

Compare and describe measurements involving time and money

Describe changes in measurement using knowledge of multiplication and division

Use knowledge of multiplication and division to solve comparison and change problems

Solve comparison and change problems in a range of contexts

In this unit pupils will learn to compare and describe measurements using multiplication and division. In the future unit pupils will apply memorised unit conversions to convert between units of measure with larger to smaller units and smaller to larger units and solve problems involving converting between units of time and money. 

 In the prior unit pupils used their knowledge of decimal place value to convert between and compare metres and centimetres and explained that different lengths can be composed additively and multiplicatively. In this unit pupils will learn to compare and describe measurements using multiplication and division.

In this unit pupils will learn to compare and describe measurements using multiplication and division, applying their understanding of scaling as a structure of multiplication.

Compare and describe measurements using knowledge of multiplication and division

A 25 cm piece of elastic is stretched to twice its length. Which image represents the problem?

How long is the elastic now that it has been stretched to twice its original length of 25 cm? The elastic is now {{ }} cm long.

A dog is three times the height of a cat. Which bar model represents this?

The cat is 30 cm tall. The dog is three times as tall. The dog is {{ }} cm tall.

Which expression represents the 30 cm tall cat and the dog three times the height?

Which statement describes this equation: 7 × 8 = 56

The blue ribbon is double the length of the white ribbon.

The white ribbon is the same length as the blue ribbon.

The white ribbon is two times the length of the blue ribbon.

The blue ribbon is two times the length of the white ribbon.

The white ribbon is 18 cm long. How long is the blue ribbon? The blue ribbon is {{ }} cm long

The red ribbon is 11 cm long. Which calculation would you need to do to calculate the length of the white ribbon?

True or false: If the white ribbon is is less than 50 cm long, the blue ribbon will be less than 1 m long.

Solve comparison and change problems using multiplication

Lesson outcome