Keystones — Lintel
Five GCSE retrieval questions · 7 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,200,000 in standard form
Answer: 9.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 66
Answer: (x + 11)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.51cm -
4. Ratio Mixed ratio problems
Simplify the ratio £2 : 70p
Answer: 20:7 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 39, 40, 25, 37, what is the missing number?
Answer: 59