Keystones — Lintel
Five GCSE retrieval questions · 14 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.077
Answer: 7.7 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 51°. Find adjacent side
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Divide 98 in the ratio 3:1:3
Answer: 42, 14 and 42 -
5. Statistics Mean
Calculate the mean of: 33, 28, 18, 49, 31, 5, 34, 29
Answer: 28.4