Keystones — Cornerstone

Five GCSE retrieval questions · 19 July 2023 · mathsvault.uk/keystones

1. Number

Calculate: ¹⁄₅ + ³⁄₅

Answer: ⁴⁄₅
2. Algebra

For y = x³ + 3, calculate y when x = 3

Answer: y = 30
3. Geometry

Opposite = 14cm, hypotenuse = 28cm. Find the angle

Answer: 30° (approximately)
4. Ratio

Simplify the ratio 21:6

Answer: 7:2
5. Statistics

Calculate the mean of: 47, 48, 37, 5, 24, 20, 19, 17

Answer: 27.1

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