Keystones — Lintel
Five GCSE retrieval questions · 12 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000015 in standard form
Answer: 1.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.08cm -
4. Ratio Mixed ratio problems
Divide 96 in the ratio 1:2:1
Answer: 24, 48 and 24 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 50, 47, 45, 15, what is the missing number?
Answer: 23