Keystones — Lintel
Five GCSE retrieval questions · 20 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 15,000 in standard form
Answer: 1.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 10.21cm -
4. Ratio Mixed ratio problems
In ratio 4:1:11, what fraction is the first part?
Answer: 1⁄4 -
5. Statistics Mean
Calculate the mean of: 19, 31, 12, 8, 28, 24, 49, 18. Give your answer to 2 decimal places
Answer: 23.63