Keystones — Lintel
Five GCSE retrieval questions · 23 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
440000
Answer: 4.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 35°. Find opposite
Answer: 20.3cm -
4. Ratio Mixed ratio problems
In ratio 2:4:1, what fraction is the second part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 35, 16, 26, 47, what is the missing number?
Answer: -14