Keystones — Lintel
Five GCSE retrieval questions · 18 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 45,000 in standard form
Answer: 4.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.24cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 75p
Answer: 8:1 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 44, 26, 26, 46, 30, what is the missing number?
Answer: 62