Keystones — Lintel
Five GCSE retrieval questions · 15 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000,000 in standard form
Answer: 1.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.29cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:18
Answer: 6:5:6 -
5. Statistics Mean
Calculate the mean of: 50, 24, 44, 42, 30, 16, 37. Give your answer to 2 decimal places
Answer: 34.71