Keystones — Lintel
Five GCSE retrieval questions · 5 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00011 in standard form
Answer: 1.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 96
Answer: (x + 12)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 9.56cm -
4. Ratio Mixed ratio problems
Express the second part of 13:14 as a fraction in simplest form
Answer: 14⁄27 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 34, 50, 21, 15, what is the missing number?
Answer: 55