Keystones — Lintel
Five GCSE retrieval questions · 5 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0017 in standard form
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 450g
Answer: 80:9 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 31, 48, 25, 37, what is the missing number?
Answer: 54