Keystones — Lintel
Five GCSE retrieval questions · 27 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 84,000 in standard form
Answer: 8.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 38.4cm -
4. Ratio Mixed ratio problems
Express the second part of 10:5 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 26, 46, 17, what is the missing number?
Answer: 63