Keystones — Cornerstone

Five GCSE retrieval questions · 14 March 2022 · mathsvault.uk/keystones

1. Number

Calculate: 52 + 68

Answer: 52 + 68 = 120
2. Algebra

Solve: 4x = 52

Answer: x = 13
3. Geometry

Opposite = 8cm, adjacent = 9cm. Calculate the angle

Answer: 41.6°
4. Ratio

Simplify: 12:6:10

Answer: 6:3:5
5. Statistics

A bag has 7 red and 3 blue balls. What is the probability of picking a red ball?

Answer: ⁷⁄₁₀

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