Keystones — Lintel
Five GCSE retrieval questions · 31 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 12.55cm -
4. Ratio Mixed ratio problems
Express the second part of 10:15 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 37, 46, 23, 36, what is the missing number?
Answer: 53