Keystones — Lintel
Five GCSE retrieval questions · 2 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 630,000 in standard form
Answer: 6.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 16.78cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 550 ml
Answer: 60:11 -
5. Statistics Mean
Calculate the mean of: 41, 7, 42, 17, 18, 49, 10. Give your answer to 2 decimal places
Answer: 26.29