Keystones — Lintel
Five GCSE retrieval questions · 17 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
83000
Answer: 8.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 65°. Find adjacent side
Answer: 13.cm -
4. Ratio Mixed ratio problems
Express the first part of 2:6 as a fraction in simplest form
Answer: 1⁄4 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 45, 20, 15, what is the missing number?
Answer: 44