Keystones — Lintel
Five GCSE retrieval questions · 5 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.08 in standard form
Answer: 8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 12.7cm -
4. Ratio Mixed ratio problems
£225.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £100.00 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 17, 39, 50, 22, what is the missing number?
Answer: 67