Keystones — Lintel
Five GCSE retrieval questions · 1 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0095 in standard form
Answer: 9.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 21.05cm -
4. Ratio Mixed ratio problems
In ratio 8:4:3, what fraction is the first part?
Answer: 8⁄15 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 37, 32, 24, 27, 49, what is the missing number?
Answer: 65