Keystones — Cornerstone

Five GCSE retrieval questions · 18 December 2023 · mathsvault.uk/keystones

1. Number

28000

Answer: 2.8 × 10⁴
2. Algebra

Solve: x + 10 = 27

Answer: x = 17
3. Geometry

Calculate the area of a circle with diameter 16cm

Answer: 201.06cm²
4. Ratio

Simplify the ratio 12:10

Answer: 6:5
5. Statistics

Calculate the mean of: 22, 20, 30, 6, 21, 34

Answer: 22.2

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