Keystones Lintel — 17 July 2015

Keystones — Lintel

Five GCSE retrieval questions · 17 July 2015 · mathsvault.uk/keystones

1. Number Converting to standard form

Write 7,700,000 in standard form

Answer: 7.7 × 10⁶
2. Algebra Factorising monic quadratics

Factorise: x² - x - 90

Answer: (x + 9)(x - 10)
3. Geometry SOHCAHTOA — missing length

Adjacent = 28cm, angle = 38°. Find opposite. Give your answer to 2 decimal places

Answer: 21.88cm
4. Ratio Mixed ratio problems

Simplify: 8:10:6

Answer: 4:5:3
5. Statistics Mean

Calculate the mean of: 40, 40, 10, 36, 45, 46, 49

Answer: 38

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