Keystones — Lintel
Five GCSE retrieval questions · 14 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000017 in standard form
Answer: 1.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 30.99cm -
4. Ratio Mixed ratio problems
Express the second part of 12:3 as a fraction in simplest form
Answer: 1⁄5 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 21, 15, 33, 22, 24, what is the missing number?
Answer: 47