Keystones — Lintel
Five GCSE retrieval questions · 20 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000 in standard form
Answer: 1.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio £4 : 65p
Answer: 80:13 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 36, 17, 41, 33, what is the missing number?
Answer: 53