Keystones — Lintel
Five GCSE retrieval questions · 31 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
31000
Answer: 3.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 37°. Find opposite
Answer: 19.6cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 19, 31, 30, what is the missing number?
Answer: 56