Keystones — Lintel
Five GCSE retrieval questions · 25 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0055 in standard form
Answer: 5.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.43cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:9
Answer: 5:6:3 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 35, 21, 40, 28, what is the missing number?
Answer: 61