Keystones — Lintel
Five GCSE retrieval questions · 5 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0038 in standard form
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.6cm -
4. Ratio Mixed ratio problems
Simplify: 8:12:20
Answer: 2:3:5 -
5. Statistics Mean
Calculate the mean of: 29, 42, 9, 30, 39, 34, 10. Give your answer to 2 decimal places
Answer: 27.57