Keystones — Lintel
Five GCSE retrieval questions · 13 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.073
Answer: 7.3 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 60°. Find opposite
Answer: 36.4cm -
4. Ratio Mixed ratio problems
In ratio 3:1:4, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 43, 18, 47, 39, what is the missing number?
Answer: 53