Keystones — Lintel
Five GCSE retrieval questions · 3 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0014
Answer: 1.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 35°. Find opposite
Answer: 16.cm -
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 4 numbers is 25. If 3 of them are 44, 27, 50, what is the missing number?
Answer: -21