Keystones — Lintel
Five GCSE retrieval questions · 3 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000027 in standard form
Answer: 2.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 18.91cm -
4. Ratio Mixed ratio problems
Simplify the ratio £3 : 80p
Answer: 15:4 -
5. Statistics Mean
Calculate the mean of: 26, 41, 17, 14, 37, 19, 37, 11
Answer: 25.25