Keystones — Lintel
Five GCSE retrieval questions · 29 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00018 in standard form
Answer: 1.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x + 4
Answer: (x + 2)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 9.61cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 8:3:7. What fraction of the counters are black?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 20, 30, 14, 24, 42, 43, 40. Give your answer to 2 decimal places
Answer: 30.43