Keystones — Lintel
Five GCSE retrieval questions · 24 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.022 in standard form
Answer: 2.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.65cm -
4. Ratio Mixed ratio problems
In ratio 6:1:8, what fraction is the third part?
Answer: 8⁄15 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 33, 27, 18, 24, what is the missing number?
Answer: 38