Key learning points

1. Change can be described using multiplication or division. Division can be represented as multiplication by a fraction.
2. The sentence 'The __________ is ___ times the size of the __________' supports us to describe a comparison or change.
3. If units are different, we should convert so that they are the same - this supports us to calculate.
4. To find a missing factor, we can divide the product by the known factor.

Keywords

• Bar model - A bar model is a pictorial representation of a problem where bars are used to represent the known and unknown quantities.

• Multiplicative - A multiplicative relationship is a comparison between numbers that relates to multiplication (and hence division). In a multiplicative relationship, the parts are equal.

• Times the __________ - Times the __________ is a phrase that is used to compare measures multiplicatively. For example, one tree might be 'three times the height' of another tree - it is three times as tall.

Common misconception