Keystones — Lintel
Five GCSE retrieval questions · 14 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
690000
Answer: 6.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 45°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:8
Answer: 3:3:2 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 48, 50, 50, 17, 30, what is the missing number?
Answer: -69