Keystones — Lintel
Five GCSE retrieval questions · 14 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,500,000 in standard form
Answer: 6.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 17.92cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 2:8:3. What fraction of the counters are green?
Answer: 3⁄13 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 19, 29, 18, what is the missing number?
Answer: 18