Keystones — Lintel
Five GCSE retrieval questions · 18 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
910000
Answer: 9.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 46°. Find opposite
Answer: 16.6cm -
4. Ratio Mixed ratio problems
In ratio 3:1:3, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 20, 30, 38, 17, what is the missing number?
Answer: 10