Keystones — Lintel
Five GCSE retrieval questions · 17 June 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
240000
Answer: 2.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite
Answer: 15.3cm -
4. Ratio Mixed ratio problems
Express the first part of 2:4 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 20, 23, 47, 49, 40, what is the missing number?
Answer: -41