Keystones — Lintel
Five GCSE retrieval questions · 25 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
270000
Answer: 2.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 30°. Find opposite
Answer: 8.7cm -
4. Ratio Mixed ratio problems
In ratio 4:3:3, what fraction is the second part?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 31, 48, 37, what is the missing number?
Answer: -20