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 before, and then after, a change. Examples of a change include a change in height of a flower due to growth.

Solve comparison and change problems using division

Maths

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.

Compare and describe measurements using knowledge of multiplication and division

A pencil was 15 cm long when it was new. It has been used and is now one third times its original size. Which image represents the change?

The length of a model car is one tenth of the length of the real car. The real car is 4 m long. Which table represents the lengths of the cars?

The dog is four times the height of the sunflower.

The sunflower is four times the height of the dog.

The dog is $${1}\over{4}$$ times the height of the sunflower.

The sunflower is $${1}\over{4}$$ times the height of the dog.

Compare the height of the tree and the sunflower and the height of the dog. Which sentences could describe the image?

A pencil was 15 cm long when it was new. It has been used and is now one third times its original size. The pencil is now {{ }} cm long.

The length of a model car is one tenth of the length of the real car. The real car is 4 m long. Which calculations could you use to work out the length of the model car?

The dog is $${1}\over{4}$$ times the height of the sunflower. Match the possible heights of the dog and the sunflower.

Which word or phrase completes the sentence: The green ribbon is ___ times the length of the white ribbon.

If the white ribbon is 39 cm long, how long is the green ribbon? The green ribbon is {{ }} cm long.

The longer white ribbon is 36 cm long. How long is the shorter red ribbon? The red ribbon is {{ }} cm long.

The white ribbon is 36 cm long. How long is the shorter red ribbon?

The longer white ribbon is 36 cm long. How long is the red ribbon?

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

The blue ribbon is one eighth times the length of the white ribbon.

The white ribbon is one eighth times the length of the blue ribbon.

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

Which statements are represented by this image?

This lesson will soon be taken down.

Solve comparison and change problems using division

Lesson outcome