Keystones — Lintel
Five GCSE retrieval questions · 30 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
51000000
Answer: 5.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 60°. Find opposite
Answer: 48.5cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:20
Answer: 5:3:5 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 42, 43, 39, what is the missing number?
Answer: 36