Keystones — Lintel
Five GCSE retrieval questions · 3 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 21x + 110
Answer: (x + 11)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.11cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:6
Answer: 2:2:1 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 47, 17, 30, 26, what is the missing number?
Answer: 20