Keystones — Lintel
Five GCSE retrieval questions · 27 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.014 in standard form
Answer: 1.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 28.17cm -
4. Ratio Mixed ratio problems
Express the second part of 11:15 as a fraction in simplest form
Answer: 15⁄26 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 32, 48, 25, 37, what is the missing number?
Answer: 53