Keystones — Lintel
Five GCSE retrieval questions · 23 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0071 in standard form
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 25.61cm -
4. Ratio Mixed ratio problems
£296.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £185.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 40, 44, 41, 32, what is the missing number?
Answer: 43