Keystones — Lintel
Five GCSE retrieval questions · 18 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
8700000
Answer: 8.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 37°. Find opposite
Answer: 12.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:4
Answer: 3:1:1 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 48, 28, 44, 16, what is the missing number?
Answer: -36