Keystones — Lintel
Five GCSE retrieval questions · 13 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0098 in standard form
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 10.17cm -
4. Ratio Mixed ratio problems
In ratio 12:11:1, what fraction is the third part?
Answer: 1⁄24 -
5. Statistics Mean
Calculate the mean of: 23, 47, 42, 5, 28, 46, 19
Answer: 30