Keystones — Lintel
Five GCSE retrieval questions · 17 May 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
8500000
Answer: 8.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 60°. Find opposite
Answer: 26cm -
4. Ratio Mixed ratio problems
Express the first part of 6:3 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 23, 17, 37, 25, 20, what is the missing number?
Answer: 82