Keystones — Lintel
Five GCSE retrieval questions · 20 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000 in standard form
Answer: 4.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 132
Answer: (x + 12)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.51cm -
4. Ratio Mixed ratio problems
In ratio 4:4:10, what fraction is the second part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 21, 22, 15, 26, what is the missing number?
Answer: 66