Keystones Lintel — 27 October 2022

Keystones — Lintel

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

1. Number Converting to standard form

59000000

Answer: 5.9 × 10⁷
2. Algebra Factorising monic quadratics

Factorise: x² + x - 20

Answer: (x + 5)(x - 4)
3. Geometry SOHCAHTOA — missing length

Hypotenuse = 32cm, angle = 49°. Find adjacent side

Answer: 21cm
4. Ratio Mixed ratio problems

Express the first part of 5:4 as a fraction in simplest form

Answer: ⁵⁄₉
5. Statistics Mean

Calculate the mean of: 15, 25, 45, 46, 48, 13, 39, 12

Answer: 30.4

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