Keystones Lintel — 15 May 2020

Keystones — Lintel

Five GCSE retrieval questions · 15 May 2020 · mathsvault.uk/keystones

1. Number Converting to standard form

68000000

Answer: 6.8 × 10⁷
2. Algebra Factorising monic quadratics

Factorise: x² + 3x - 10

Answer: (x + 5)(x - 2)
3. Geometry SOHCAHTOA — missing length

Adjacent = 20cm, angle = 49°. Find opposite

Answer: 23cm
4. Ratio Mixed ratio problems

Simplify: 8:10:12

Answer: 4:5:6
5. Statistics Mean

Calculate the mean of: 25, 18, 13, 21, 10, 49, 19

Answer: 22.1

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