Keystones — Lintel
Five GCSE retrieval questions · 26 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000045 in standard form
Answer: 4.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 45°. Find opposite
Answer: 30cm -
4. Ratio Mixed ratio problems
Express the second part of 3:8 as a fraction in simplest form
Answer: 8⁄11 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 48, 30, 30, 25, what is the missing number?
Answer: 17