Keystones — Lintel
Five GCSE retrieval questions · 26 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,800,000 in standard form
Answer: 4.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.01cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 700g
Answer: 40:7 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 28, 24, 39, 16, 29, what is the missing number?
Answer: 50