Keystones — Lintel
Five GCSE retrieval questions · 11 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.042 in standard form
Answer: 4.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 22x + 121
Answer: (x + 11)(x + 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.09cm -
4. Ratio Mixed ratio problems
In ratio 11:11:10, what fraction is the first part?
Answer: 11⁄32 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 50, 18, 34, 37, what is the missing number?
Answer: 6