Keystones — Lintel
Five GCSE retrieval questions · 7 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,600,000 in standard form
Answer: 1.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 19.97cm -
4. Ratio Mixed ratio problems
Express the first part of 6:8 as a fraction in simplest form
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 26, 38, 23, 13, 45, 27, 37. Give your answer to 2 decimal places
Answer: 29.86