Keystones — Cornerstone

Five GCSE retrieval questions · 20 April 2024 · mathsvault.uk/keystones

1. Number

What is the missing number: 82 + ? = 144

Answer: 62
2. Algebra

Expand: 7(x + 7)

Answer: 7x + 49
3. Geometry

Opposite = 7cm, hypotenuse = 8.cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify: 24:16:16

Answer: 3:2:2
5. Statistics

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

Answer: ¹⁄₂

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