Keystones — Lintel
Five GCSE retrieval questions · 15 March 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.032
Answer: 3.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 51°. Find opposite
Answer: 37cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 46, 18, 35, 22, 17, what is the missing number?
Answer: 24