Keystones — Lintel
Five GCSE retrieval questions · 19 April 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00023
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 58°. Find opposite
Answer: 48cm -
4. Ratio Mixed ratio problems
Simplify: 4:10:12
Answer: 2:5:6 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 50, 22, 41, what is the missing number?
Answer: -17