Keystones — Lintel
Five GCSE retrieval questions · 21 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.087 in standard form
Answer: 8.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 55
Answer: (x + 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 22.64cm -
4. Ratio Mixed ratio problems
Simplify: 4:8:12
Answer: 1:2:3 -
5. Statistics Mean
Calculate the mean of: 22, 8, 39, 30, 7, 31, 29, 11. Give your answer to 2 decimal places
Answer: 22.13