Keystones — Lintel
Five GCSE retrieval questions · 12 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00093 in standard form
Answer: 9.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.81cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:16
Answer: 3:3:4 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 38, 38, 46, what is the missing number?
Answer: 18