Keystones — Lintel
Five GCSE retrieval questions · 2 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 77
Answer: (x + 11)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 8.77cm -
4. Ratio Mixed ratio problems
£396.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £220.00 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 15, 28, 39, 35, 29, what is the missing number?
Answer: 10