Keystones — Lintel
Five GCSE retrieval questions · 28 July 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
39000000
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 59°. Find opposite
Answer: 18.3cm -
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 6 numbers is 23. If 5 of them are 45, 34, 29, 49, 38, what is the missing number?
Answer: -57