Keystones — Lintel
Five GCSE retrieval questions · 14 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.09cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:16
Answer: 2:3:2 -
5. Statistics Mean
Calculate the mean of: 27, 14, 34, 13, 29, 32. Give your answer to 2 decimal places
Answer: 24.83