Keystones — Lintel
Five GCSE retrieval questions · 14 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.77cm -
4. Ratio Mixed ratio problems
£252.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £84.00 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 37, 16, 40, what is the missing number?
Answer: 47