Keystones — Lintel
Five GCSE retrieval questions · 16 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00086 in standard form
Answer: 8.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 14
Answer: (x + 7)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 40.03cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 11:8. What fraction of the marbles are black?
Answer: 11⁄19 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 49, 37, 31, 19, what is the missing number?
Answer: 34