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Topic: Ratio and Proportion (Foundation - Unit 1)

Specification References: N3.1 N3.1 Use ratio notation, including reduction to its simplest form and its various links to fraction notation.

Candidates should be able to:

• understand the meaning of ratio notation
• interpret ratio as a fraction
• simplify ratios to the simplest form a : b where a and b are integers

Notes

This is part of the core number work required across all units. Ratio may be linked to probability, for example, candidates should know that if, say, red balls and blue balls are in the ratio 3 : 4 in a bag then the probability of randomly obtaining a red ball is

Examples

1. There are 6 girls and 27 boys in an after-school computer club.
   Write the ratio of girls : boys in its simplest form.

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