Keystones — Lintel
Five GCSE retrieval questions · 3 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,200,000 in standard form
Answer: 1.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.61cm -
4. Ratio Mixed ratio problems
£405.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £225.00 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 38, 28, 48, 45, what is the missing number?
Answer: 26