Equivalent Ratios — Interactive Lesson (KS3)

By the end of this unit, students will:

1. understand that ratio shows the relationship between two values and can describe how one relates to the other;
2. understand the colon notation as the ratio symbol;
3. find equivalent ratios by dividing or multiplying by the same number.

Curriculum Alignment: Key Stage 3: Ratio, proportion and rates of change

• use ratio notation, including reduction to simplest form.
• divide a given quantity into 2 parts in a given part:part or part:whole ratio; express the division of a quantity into 2 parts as a ratio.
• understand that a multiplicative relationship between 2 quantities can be expressed as a ratio or a fraction.
• relate the language of ratios and the associated calculations to the arithmetic of fractions and to linear functions.

Designed for ages 11–14 (UK Year 7–9). Aligned to the UK National Curriculum; adaptable to US state standards.