Keystones — Cornerstone

Five GCSE retrieval questions · 9 June 2025 · mathsvault.uk/keystones

1. Number

Calculate: ³⁄₅ + ¹⁄₅

Answer: ⁴⁄₅
2. Algebra

Expand: 9(x + 9)

Answer: 9x + 81
3. Geometry

Opposite = 8cm, hypotenuse = 11.3cm. Find the angle

Answer: 45° (approximately)
4. Ratio

Calculate 25% of 36

Answer: 9
5. Statistics

Calculate the mean of: 15, 13, 32, 6, 37, 42

Answer: 24.2

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