Keystones — Cornerstone

Five GCSE retrieval questions · 12 December 2022 · mathsvault.uk/keystones

1. Number

Calculate: 99 + 76

Answer: 99 + 76 = 175
2. Algebra

Factorise: 9x² + 2x

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

Opposite = 12cm, adjacent = 11cm. Calculate the angle

Answer: 47.5°
4. Ratio

Simplify: 12:6:10

Answer: 6:3:5
5. Statistics

A bag has 4 red and 4 blue balls. What is the probability of picking a red ball?

Answer: ¹⁄₂

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