Keystones — Lintel
Five GCSE retrieval questions · 8 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000035 in standard form
Answer: 3.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.37cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 15:7. What fraction of the counters are black?
Answer: 15⁄22 -
5. Statistics Mean
Calculate the mean of: 23, 32, 40, 34, 33, 10. Give your answer to 2 decimal places
Answer: 28.67