Keystones — Lintel
Five GCSE retrieval questions · 4 June 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00049 in standard form
Answer: 4.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 8.41cm -
4. Ratio Mixed ratio problems
In ratio 8:5:5, what fraction is the third part?
Answer: 5⁄18 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 25, 40, 31, what is the missing number?
Answer: 52