Keystones — Lintel
Five GCSE retrieval questions · 29 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00064 in standard form
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.88cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:16
Answer: 3:5:4 -
5. Statistics Mean
Calculate the mean of: 11, 49, 22, 38, 13, 50, 11. Give your answer to 2 decimal places
Answer: 27.71