Keystones — Lintel
Five GCSE retrieval questions · 26 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000063 in standard form
Answer: 6.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 56
Answer: (x + 8)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 12.6cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 5:5:3. What fraction of the counters are blue?
Answer: 5⁄13 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 47, 16, 48, 17, 33, what is the missing number?
Answer: 55