Keystones — Lintel
Five GCSE retrieval questions · 24 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.076 in standard form
Answer: 7.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 14.7cm -
4. Ratio Mixed ratio problems
£161.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £46.00 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 25, 32, 39, 27, 36, what is the missing number?
Answer: 45