Keystones — Lintel
Five GCSE retrieval questions · 11 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00006 in standard form
Answer: 6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.71cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:12
Answer: 1:3:3 -
5. Statistics Mean
Calculate the mean of: 15, 13, 49, 47, 24, 8, 9. Give your answer to 2 decimal places
Answer: 23.57