Keystones — Lintel
Five GCSE retrieval questions · 18 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 350,000,000 in standard form
Answer: 3.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 55
Answer: (x + 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.12cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:18
Answer: 3:5:6 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 15, 35, 26, 36, what is the missing number?
Answer: 33