Keystones — Lintel
Five GCSE retrieval questions · 21 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000033 in standard form
Answer: 3.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 40
Answer: (x + 8)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.89cm -
4. Ratio Mixed ratio problems
£261.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £116.00 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 21, 23, 41, what is the missing number?
Answer: 23