Keystones Lintel — 20 February 2021

Keystones — Lintel

Five GCSE retrieval questions · 20 February 2021 · mathsvault.uk/keystones

1. Number Converting to standard form

8200000

Answer: 8.2 × 10⁶
2. Algebra Factorising monic quadratics

Factorise: x² - 10x + 24

Answer: (x - 4)(x - 6)
3. Geometry SOHCAHTOA — missing length

Adjacent = 27cm, angle = 56°. Find opposite

Answer: 40cm
4. Ratio Mixed ratio problems

Simplify: 12:4:12

Answer: 3:1:3
5. Statistics Mean

Calculate the mean of: 48, 10, 12, 48, 10, 29, 15

Answer: 24.6

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