Keystones — Lintel
Five GCSE retrieval questions · 4 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0097 in standard form
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 7
Answer: (x + 7)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 33.03cm -
4. Ratio Mixed ratio problems
In ratio 7:9:5, what fraction is the first part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 20, 40, 50, 26, what is the missing number?
Answer: 19