Keystones — Lintel
Five GCSE retrieval questions · 30 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000017 in standard form
Answer: 1.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 54
Answer: (x + 9)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 23.72cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 350g
Answer: 120:7 -
5. Statistics Mean
Calculate the mean of: 5, 5, 40, 28, 45, 27, 10. Give your answer to 2 decimal places
Answer: 22.86