Keystones — Lintel
Five GCSE retrieval questions · 19 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0071 in standard form
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 36
Answer: (x + 12)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 10.55cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 2:10:5. What fraction of the beads are green?
Answer: 5⁄17 -
5. Statistics Mean
Calculate the mean of: 21, 44, 16, 13, 17, 17, 20, 44
Answer: 24