Keystones — Lintel
Five GCSE retrieval questions · 25 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,400,000 in standard form
Answer: 3.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 12
Answer: (x + 6)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.47cm -
4. Ratio Mixed ratio problems
Simplify: 4:4:6
Answer: 2:2:3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 16, 38, 38, 45, what is the missing number?
Answer: 23