Keystones — Cornerstone

Five GCSE retrieval questions · 27 November 2022 · mathsvault.uk/keystones

1. Number

5000

Answer: 5 × 10³
2. Algebra

Solve: 3x = 27

Answer: x = 9
3. Geometry

Find the perimeter of a right triangle with sides 6cm, 8cm, 10cm

Answer: 24cm
4. Ratio

Simplify the ratio 12:10

Answer: 6:5
5. Statistics

Find the mean of: 13, 7, 8, 8, 5

Answer: 8.2

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