Keystones — Lintel
Five GCSE retrieval questions · 17 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0022
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 30°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 15, 27, 22, 47, what is the missing number?
Answer: 79