Keystones — Lintel
Five GCSE retrieval questions · 14 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0072
Answer: 7.2 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 47°. Find opposite
Answer: 13.9cm -
4. Ratio Mixed ratio problems
Express the first part of 6:3 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
Calculate the mean of: 12, 46, 33, 24, 30, 50, 26
Answer: 31.6