Keystones — Lintel
Five GCSE retrieval questions · 14 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 55
Answer: (x + 11)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.27cm -
4. Ratio Mixed ratio problems
Express the first part of 13:3 as a fraction in simplest form
Answer: 13⁄16 -
5. Statistics Mean
Calculate the mean of: 22, 36, 21, 31, 30, 40, 26, 26
Answer: 29