Keystones — Lintel
Five GCSE retrieval questions · 24 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0054
Answer: 5.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 56°. Find opposite
Answer: 37.cm -
4. Ratio Mixed ratio problems
In ratio 1:2:1, what fraction is the second part?
Answer: 2⁄4 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 26, 25, 29, 22, 26, what is the missing number?
Answer: -2