Keystones — Lintel
Five GCSE retrieval questions · 5 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
40000
Answer: 4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 60°. Find opposite
Answer: 52cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:12
Answer: 3:1:3 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 47, 38, 21, what is the missing number?
Answer: 54