Keystones — Lintel
Five GCSE retrieval questions · 1 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000045 in standard form
Answer: 4.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.23cm -
4. Ratio Mixed ratio problems
£110.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £66.00 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 29, 18, 42, 30, what is the missing number?
Answer: 61