Keystones — Cornerstone

Five GCSE retrieval questions · 16 July 2023 · mathsvault.uk/keystones

1. Number

20000

Answer: 2 × 10⁴
2. Algebra

What is the next term? 7, 21, 63, 189, ...

Answer: 567
3. Geometry

Find the area of a circle with radius 3cm

Answer: 28.27cm²
4. Ratio

Simplify the ratio 24:21

Answer: 8:7
5. Statistics

Calculate the mean of: 47, 16, 8, 42, 45, 42

Answer: 33.3

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