Keystones — Lintel
Five GCSE retrieval questions · 9 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 180,000,000 in standard form
Answer: 1.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 12
Answer: (x + 4)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.06cm -
4. Ratio Mixed ratio problems
£252.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £108.00 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 36, 46, 24, 20, what is the missing number?
Answer: 69