Keystones — Lintel
Five GCSE retrieval questions · 23 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 12.82cm -
4. Ratio Mixed ratio problems
Express the first part of 10:13 as a fraction in simplest form
Answer: 10⁄23 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 36, 24, 27, 36, what is the missing number?
Answer: 22