Keystones — Lintel
Five GCSE retrieval questions · 8 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 12,000 in standard form
Answer: 1.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 108
Answer: (x + 12)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.86cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:6
Answer: 3:4:2 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 18, 34, 40, what is the missing number?
Answer: 8