Keystones — Lintel
Five GCSE retrieval questions · 16 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0099 in standard form
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 24
Answer: (x + 8)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.74cm -
4. Ratio Mixed ratio problems
In ratio 4:1:5, what fraction is the first part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 15, 38, 33, what is the missing number?
Answer: 50