Keystones — Lintel
Five GCSE retrieval questions · 28 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0054
Answer: 5.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 39°. Find adjacent side
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:12
Answer: 2:5:4 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 25, 23, 15, what is the missing number?
Answer: 25