Keystones — Lintel
Five GCSE retrieval questions · 21 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 42°. Find opposite
Answer: 25.2cm -
4. Ratio Mixed ratio problems
Express the first part of 5:2 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 36, 15, 42, 34, 21, what is the missing number?
Answer: 44