Times the length/height/depth is a phrase that is used to compare and describe lengths or heights. For example, one tree might be three times the height of another tree; it is three times as tall.

Twice means ‘two times as many’. For example, ‘He asked her twice’ means she was asked two times. In maths, we can say twice four is eight because two times four is eight.

Compare and describe lengths using knowledge of multiplication

Maths

Solve comparison and change problems using 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

The black ribbon is 3 times the length of one white ribbon.

The white ribbon is 3 times the length of one black ribbon.

The black ribbon is 4 times the length of one white ribbon.

The white ribbon is 4 times the length of one black ribbon.

The black ribbon is 6 cm long. How long is the white ribbon? The white ribbon is {{ }} cm long.

The black ribbon is 7 cm long. Which calculation would you need to use to calculate the length of the white ribbon?

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

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

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

The length of the white ribbon is twice the length of the green ribbon.

The green ribbon is 12 cm long. How long is the white ribbon?

Which equation describes the length of the blue ribbon?

Which calculation would solve this problem: How many 8s are there in 72?

Compare and describe lengths using knowledge of multiplication

Lesson outcome