Keystones — Cornerstone

Five GCSE retrieval questions · 29 March 2026 · mathsvault.uk/keystones

1. Number

Find the total of 198, 153, and 150

Answer: 501
2. Algebra

Simplify: 6x + 2x

Answer: 8x
3. Geometry

Opposite = 13cm, hypotenuse = 15cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify: 20:20:24

Answer: 5:5:6
5. Statistics

What is the probability of rolling a 4 on a fair die?

Answer: ¹⁄₆

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