Keystones — Lintel
Five GCSE retrieval questions · 3 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000,000 in standard form
Answer: 2.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x - 24
Answer: (x + 12)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.05cm -
4. Ratio Mixed ratio problems
Divide 162 in the ratio 1:2:3
Answer: 27, 54 and 81 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 46, 32, 24, 32, what is the missing number?
Answer: 61