Keystones — Cornerstone

Five GCSE retrieval questions · 19 November 2022 · mathsvault.uk/keystones

1. Number

570000

Answer: 5.7 × 10⁵
2. Algebra

Solve: 9x - 5 = 5x + 15

Answer: x = 5
3. Geometry

Opposite = 18cm, adjacent = 13cm. Calculate the angle

Answer: 54.2°
4. Ratio

Simplify: 12:6:9

Answer: 4:2:3
5. Statistics

Find the mean of: 19, 16, 18

Answer: 17.666666666667

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