Keystones — Lintel
Five GCSE retrieval questions · 17 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00084
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 49°. Find adjacent side
Answer: 15.7cm -
4. Ratio Mixed ratio problems
Express the first part of 5:6 as a fraction in simplest form
Answer: 5⁄11 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 34, 50, 28, what is the missing number?
Answer: 0