Keystones — Lintel
Five GCSE retrieval questions · 30 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00079
Answer: 7.9 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 62°. Find adjacent side
Answer: 10.3cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 3:4:3
Answer: 45, 60 and 45 -
5. Statistics Mean
Calculate the mean of: 12, 25, 41, 38, 28, 32, 31, 10
Answer: 27.1