Keystones — Cornerstone

Five GCSE retrieval questions · 29 May 2025 · mathsvault.uk/keystones

1. Number

24000

Answer: 2.4 × 10⁴
2. Algebra

Factorise: 20x + 35

Answer: 5(4x + 7)
3. Geometry

Opposite = 15cm, adjacent = 17cm. Calculate the angle

Answer: 41.4°
4. Ratio

Simplify: 16:16:20

Answer: 4:4:5
5. Statistics

Find the mean of: 9, 20, 16, 9, 7

Answer: 12.2

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