Keystones — Cornerstone

Five GCSE retrieval questions · 17 February 2022 · mathsvault.uk/keystones

1. Number

91000000

Answer: 9.1 × 10⁷
2. Algebra

For y = x³, find y when x = 4

Answer: y = 64
3. Geometry

Find the hypotenuse of a right triangle with sides 8cm and 15cm

Answer: 17cm
4. Ratio

Simplify the ratio 20:16

Answer: 5:4
5. Statistics

Calculate the mean of: 41, 49, 13, 39, 6, 34

Answer: 30.3

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