Keystones Lintel — 10 January 2023

Keystones — Lintel

Five GCSE retrieval questions · 10 January 2023 · mathsvault.uk/keystones

1. Number Converting to standard form

860000

Answer: 8.6 × 10⁵
2. Algebra Factorising monic quadratics

Factorise: x² + 4x - 5

Answer: (x + 5)(x - 1)
3. Geometry SOHCAHTOA — missing length

Adjacent = 12cm, angle = 31°. Find opposite

Answer: 7.2cm
4. Ratio Mixed ratio problems

Simplify the ratio 4m:400cm

Answer: 1:100
5. Statistics Mean

Calculate the mean of: 9, 6, 49, 44, 30, 22, 45

Answer: 29.3

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