Keystones — Cornerstone

Five GCSE retrieval questions · 11 August 2023 · mathsvault.uk/keystones

1. Number

Calculate: 158 + 721

Answer: 158 + 721 = 879
2. Algebra

Solve: 8x = 56

Answer: x = 7
3. Geometry

Opposite = 7cm, hypotenuse = 9.9cm. Find the angle

Answer: 45° (approximately)
4. Ratio

Simplify: 12:18:9

Answer: 4:6:3
5. Statistics

What is the probability of getting heads when flipping a fair coin?

Answer: ¹⁄₂

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