Keystones — Lintel
Five GCSE retrieval questions · 6 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 11,000,000 in standard form
Answer: 1.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x - 11
Answer: (x + 11)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.52cm -
4. Ratio Mixed ratio problems
Simplify: 24:24:20
Answer: 6:6:5 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 21, 33, 31, what is the missing number?
Answer: 15