Keystones — Cornerstone

Five GCSE retrieval questions · 26 August 2023 · mathsvault.uk/keystones

1. Number

What is the missing number: 74 + ? = 161

Answer: 87
2. Algebra

Solve: x + 4 = 7

Answer: x = 3
3. Geometry

Opposite = 6cm, hypotenuse = 8.5cm. Find the angle

Answer: 45° (approximately)
4. Ratio

Simplify: 8:6:10

Answer: 4:3:5
5. Statistics

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

Answer: ¹⁄₂

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