Keystones — Lintel
Five GCSE retrieval questions · 13 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 790,000,000 in standard form
Answer: 7.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 28.88cm -
4. Ratio Mixed ratio problems
Express the second part of 5:12 as a fraction in simplest form
Answer: 12⁄17 -
5. Statistics Mean
Calculate the mean of: 39, 43, 7, 20, 40, 44. Give your answer to 2 decimal places
Answer: 32.17