Keystones — Cornerstone

Five GCSE retrieval questions · 21 March 2024 · mathsvault.uk/keystones

1. Number

Simplify: x³ × x⁴

Answer: x⁷
2. Algebra

Factorise: 21x + 12

Answer: 3(7x + 4)
3. Geometry

Calculate perimeter: two sides are 7cm and 7cm at right angles

Answer: 23.9cm
4. Ratio

Simplify: 18:18:12

Answer: 3:3:2
5. Statistics

Find the range of: 26, 20, 35, 37, 21

Answer: 17

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