Keystones — Lintel
Five GCSE retrieval questions · 30 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0011 in standard form
Answer: 1.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.74cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 20 minutes
Answer: 6:1 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 35, 18, 30, what is the missing number?
Answer: 65