Keystones — Lintel
Five GCSE retrieval questions · 2 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 75,000,000 in standard form
Answer: 7.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 2
Answer: (x + 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio £7 : 85p
Answer: 140:17 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 35, 37, 16, 42, what is the missing number?
Answer: 35