Keystones Cornerstone — 19 November 2021

Keystones — Cornerstone

Five GCSE retrieval questions · 19 November 2021 · mathsvault.uk/keystones

1. Number

900000

Answer: 9 × 10⁵
2. Algebra

Factorise: 2x² + 9x

Answer: x(2x + 9)
3. Geometry

Opposite = 13cm, hypotenuse = 15cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify the ratio 21:15

Answer: 7:5
5. Statistics

Calculate the mean of: 22, 5, 20, 46, 39, 7

Answer: 23.2

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