Keystones — Lintel
Five GCSE retrieval questions · 13 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0077 in standard form
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 32
Answer: (x + 8)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.28cm -
4. Ratio Mixed ratio problems
£400.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £250.00 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 15, 49, 49, what is the missing number?
Answer: 7