Keystones — Lintel
Five GCSE retrieval questions · 19 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 510,000,000 in standard form
Answer: 5.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.05cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m : 15cm
Answer: 20:1 -
5. Statistics Mean
Calculate the mean of: 46, 14, 47, 13, 15, 18
Answer: 25.5