Keystones — Lintel
Five GCSE retrieval questions · 29 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00062 in standard form
Answer: 6.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.85cm -
4. Ratio Mixed ratio problems
In ratio 9:3:3, what fraction is the third part?
Answer: 1⁄5 -
5. Statistics Mean
Calculate the mean of: 19, 13, 45, 8, 37, 48, 21. Give your answer to 2 decimal places
Answer: 27.29