Keystones — Lintel
Five GCSE retrieval questions · 2 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.049 in standard form
Answer: 4.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 40
Answer: (x + 10)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.86cm -
4. Ratio Mixed ratio problems
£272.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £170.00 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 42, 21, 40, what is the missing number?
Answer: 9