Mathematics Ratio & Proportion Language 9–11 yrs

Percentages (age 9+)

百分数（9岁以上）

Description

Know and use the vocabulary of ratio and proportion — ratio, proportion, percentage, scale, equivalent, unequal, relative size, part-to-part, part-to-whole, and out of — and understand the difference between ratio (comparing parts to parts) and proportion (comparing a part to the whole)

Mastery Evidence

✓ Explain the difference between a 'ratio' and a 'proportion' using a concrete example like mixing paint
✓ Use 'per cent' correctly and convert between fractions, decimals, and percentages in context
✓ Define 'scale factor' and use it to describe how a shape has been enlarged or reduced

Assessment Prompt

If your child is sharing something 3 ways and 2 ways, can they explain the difference between a ratio (like 3:2) and a proportion (like 3 out of 5) — showing they know what each word means?