Keystones — Lintel
Five GCSE retrieval questions · 26 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0028 in standard form
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 8
Answer: (x + 8)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.99cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 6:10. What fraction of the counters are black?
Answer: 3⁄8 -
5. Statistics Mean
Calculate the mean of: 6, 50, 34, 15, 20, 29, 14, 26
Answer: 24.25