Keystones — Lintel
Five GCSE retrieval questions · 25 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0069
Answer: 6.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 49°. Find adjacent side
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:10
Answer: 6:3:5 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 36, 34, 21, 35, what is the missing number?
Answer: -6