Keystones — Lintel
Five GCSE retrieval questions · 17 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00013
Answer: 1.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 60°. Find adjacent side
Answer: 19.5cm -
4. Ratio Mixed ratio problems
Express the first part of 6:5 as a fraction in simplest form
Answer: 6⁄11 -
5. Statistics Mean
Calculate the mean of: 45, 42, 12, 35, 18, 49
Answer: 33.5