Keystones — Lintel
Five GCSE retrieval questions · 11 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 110,000 in standard form
Answer: 1.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.47cm -
4. Ratio Mixed ratio problems
Simplify: 4:10:10
Answer: 2:5:5 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 18, 49, 33, 18, what is the missing number?
Answer: 52