Keystones — Lintel
Five GCSE retrieval questions · 23 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000085 in standard form
Answer: 8.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 34.64cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 2:3:1
Answer: 24, 36 and 12 -
5. Statistics Mean
Calculate the mean of: 8, 8, 43, 33, 47, 10. Give your answer to 2 decimal places
Answer: 24.83