Keystones — Lintel
Five GCSE retrieval questions · 13 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
3700000
Answer: 3.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 43°. Find opposite
Answer: 18.7cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:12
Answer: 1:3:2 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 30, 21, 37, 30, 23, what is the missing number?
Answer: 75