Keystones — Lintel
Five GCSE retrieval questions · 7 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00047
Answer: 4.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 61°. Find adjacent side
Answer: 15cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 50, 40, 18, what is the missing number?
Answer: -28