Keystones Lintel — 17 January 2011

Keystones — Lintel

Five GCSE retrieval questions · 17 January 2011 · mathsvault.uk/keystones

1. Number Converting to standard form

Write 99,000 in standard form

Answer: 9.9 × 10⁴
2. Algebra Factorising monic quadratics

Factorise: x² + 13x + 22

Answer: (x + 11)(x + 2)
3. Geometry SOHCAHTOA — missing length

Hypotenuse = 32cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places

Answer: 20.99cm
4. Ratio Mixed ratio problems

Simplify: 15:12:15

Answer: 5:4:5
5. Statistics Mean

Calculate the mean of: 18, 39, 47, 14, 23, 6, 29, 10

Answer: 23.25

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