Keystones — Lintel
Five GCSE retrieval questions · 6 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,500,000 in standard form
Answer: 7.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.38cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:24
Answer: 3:2:6 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 47, 23, 40, what is the missing number?
Answer: 30