Keystones — Cornerstone

Five GCSE retrieval questions · 30 April 2022 · mathsvault.uk/keystones

1. Number

79000

Answer: 7.9 × 10⁴
2. Algebra

Factorise: 48x + 30

Answer: 6(8x + 5)
3. Geometry

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

Answer: 45° (approximately)
4. Ratio

Calculate 10% of 21

Answer: 2.1
5. Statistics

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

Answer: ¹⁄₂

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