Keystones — Lintel
Five GCSE retrieval questions · 20 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0015 in standard form
Answer: 1.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.54cm -
4. Ratio Mixed ratio problems
Simplify: 12:10:10
Answer: 6:5:5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 23, 49, 41, 45, what is the missing number?
Answer: 17