Keystones — Lintel
Five GCSE retrieval questions · 6 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 180,000,000 in standard form
Answer: 1.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.96cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 2:5. What fraction of the counters are black?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 39, 18, 15, 37, what is the missing number?
Answer: 6