Keystones — Cornerstone

Five GCSE retrieval questions · 19 December 2025 · mathsvault.uk/keystones

1. Number

89000

Answer: 8.9 × 10⁴
2. Algebra

Expand: 4(x + 2)

Answer: 4x + 8
3. Geometry

Opposite = 15cm, hypotenuse = 21.2cm. Find the angle

Answer: 45° (approximately)
4. Ratio

Simplify the ratio 40:35

Answer: 8:7
5. Statistics

Find the mean of: 9, 19, 14, 3

Answer: 11.25

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