Keystones — Lintel
Five GCSE retrieval questions · 21 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00096
Answer: 9.6 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 34°. Find opposite
Answer: 7.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 34, 42, 50, what is the missing number?
Answer: -34