Keystones — Lintel
Five GCSE retrieval questions · 9 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 34,000,000 in standard form
Answer: 3.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.59cm -
4. Ratio Mixed ratio problems
£215.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £129.00 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 19, 25, 44, 24, what is the missing number?
Answer: 13