Keystones — Lintel
Five GCSE retrieval questions · 24 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.09 in standard form
Answer: 9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 24.85cm -
4. Ratio Mixed ratio problems
£315.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £135.00 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 31, 15, 42, what is the missing number?
Answer: 16