Keystones — Lintel
Five GCSE retrieval questions · 31 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.047 in standard form
Answer: 4.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 25.11cm -
4. Ratio Mixed ratio problems
Express the first part of 5:8 as a fraction in simplest form
Answer: 5⁄13 -
5. Statistics Mean
Calculate the mean of: 44, 16, 15, 31, 47, 26, 27. Give your answer to 2 decimal places
Answer: 29.43