Keystones Lintel — 22 February 2013

Keystones — Lintel

Five GCSE retrieval questions · 22 February 2013 · mathsvault.uk/keystones

1. Number Converting to standard form

Write 120,000 in standard form

Answer: 1.2 × 10⁵
2. Algebra Factorising monic quadratics

Factorise: x² - 17x + 60

Answer: (x - 5)(x - 12)
3. Geometry SOHCAHTOA — missing length

Hypotenuse = 31cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places

Answer: 26.29cm
4. Ratio Mixed ratio problems

Simplify: 4:4:12

Answer: 1:1:3
5. Statistics Mean

Calculate the mean of: 44, 7, 17, 34, 45, 47, 40, 22

Answer: 32

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