Keystones — Lintel
Five GCSE retrieval questions · 1 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0097 in standard form
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 45°. Find opposite
Answer: 25cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 10:6:3. What fraction of the beads are red?
Answer: 10⁄19 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 29, 36, 31, what is the missing number?
Answer: 8