Keystones — Lintel
Five GCSE retrieval questions · 15 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0036 in standard form
Answer: 3.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 16.41cm -
4. Ratio Mixed ratio problems
In ratio 1:2:5, what fraction is the third part?
Answer: 5⁄8 -
5. Statistics Mean
Calculate the mean of: 6, 17, 42, 23, 35, 18, 43, 34
Answer: 27.25