Keystones — Lintel
Five GCSE retrieval questions · 6 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.006 in standard form
Answer: 6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
£270.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £90.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 29, 21, 33, 47, what is the missing number?
Answer: 70