Keystones — Lintel
Five GCSE retrieval questions · 26 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 39,000,000 in standard form
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.93cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 50g
Answer: 100:1 -
5. Statistics Mean
Calculate the mean of: 42, 48, 45, 9, 49, 41, 16, 8
Answer: 32.25