Keystones — Lintel
Five GCSE retrieval questions · 19 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.044 in standard form
Answer: 4.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 66
Answer: (x + 11)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18cm -
4. Ratio Mixed ratio problems
Simplify: 16:16:20
Answer: 4:4:5 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 42, 22, 17, 30, 32, what is the missing number?
Answer: 43