Keystones Lintel — 24 November 2013

Keystones — Lintel

Five GCSE retrieval questions · 24 November 2013 · mathsvault.uk/keystones

1. Number Converting to standard form

Write 63,000 in standard form

Answer: 6.3 × 10⁴
2. Algebra Factorising monic quadratics

Factorise: x² + 2x - 8

Answer: (x + 4)(x - 2)
3. Geometry SOHCAHTOA — missing length

Adjacent = 13cm, angle = 52°. Find opposite. Give your answer to 2 decimal places

Answer: 16.64cm
4. Ratio Mixed ratio problems

Simplify: 16:20:20

Answer: 4:5:5
5. Statistics Mean

Calculate the mean of: 33, 24, 5, 42, 43, 24

Answer: 28.5

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