Keystones — Lintel
Five GCSE retrieval questions · 21 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 790,000,000 in standard form
Answer: 7.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.46cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:16
Answer: 3:5:4 -
5. Statistics Mean
Calculate the mean of: 43, 33, 27, 49, 32, 34. Give your answer to 2 decimal places
Answer: 36.33