Keystones — Lintel
Five GCSE retrieval questions · 14 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0092 in standard form
Answer: 9.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
£264.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £176.00 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 21, 47, 25, 16, what is the missing number?
Answer: 41