Keystones — Lintel
Five GCSE retrieval questions · 16 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000,000 in standard form
Answer: 2.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 26.07cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 10cm
Answer: 20:1 -
5. Statistics Mean
Calculate the mean of: 44, 16, 49, 16, 30, 50, 9, 13. Give your answer to 2 decimal places
Answer: 28.38