Keystones — Cornerstone

Five GCSE retrieval questions · 9 August 2022 · mathsvault.uk/keystones

1. Number

Simplify: x⁸ × x⁷

Answer: x¹⁵
2. Algebra

Factorise: 20x + 28

Answer: 4(5x + 7)
3. Geometry

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

Answer: 17cm
4. Ratio

Find 26% of 181

Answer: 47.06
5. Statistics

Calculate the range of: 70, 42, 58, 45, 38, 38

Answer: 32

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