Keystones — Cornerstone

Five GCSE retrieval questions · 30 October 2025 · mathsvault.uk/keystones

1. Number

38000000

Answer: 3.8 × 10⁷
2. Algebra

Factorise: 6x + 9

Answer: 3(2x + 3)
3. Geometry

Opposite = 8cm, hypotenuse = 16cm. Find the angle

Answer: 30° (approximately)
4. Ratio

Find 23% of 73

Answer: 16.79
5. Statistics

Calculate the mean of: 21, 46, 44, 7, 44, 40

Answer: 33.7

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