Keystones — Lintel
Five GCSE retrieval questions · 11 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 980,000 in standard form
Answer: 9.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 13.46cm -
4. Ratio Mixed ratio problems
Express the first part of 12:11 as a fraction in simplest form
Answer: 12⁄23 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 40, 39, 33, 49, 29, what is the missing number?
Answer: 50