Keystones — Lintel
Five GCSE retrieval questions · 18 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.6cm -
4. Ratio Mixed ratio problems
£175.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £50.00 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 19, 18, 35, what is the missing number?
Answer: 20