Keystones — Lintel
Five GCSE retrieval questions · 10 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 29,000,000 in standard form
Answer: 2.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Simplify the ratio £9 : 60p
Answer: 15:1 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 41, 48, 18, 48, 18, what is the missing number?
Answer: 19