Keystones — Lintel
Five GCSE retrieval questions · 13 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 37°. Find adjacent side
Answer: 20cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 3:1:2
Answer: 72, 24 and 48 -
5. Statistics Mean
Calculate the mean of: 45, 29, 40, 14, 40, 27, 44
Answer: 34.1