Keystones — Lintel
Five GCSE retrieval questions · 25 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
60000000
Answer: 6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 49°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 30, 30, 34, 22, what is the missing number?
Answer: -11