Keystones — Lintel
Five GCSE retrieval questions · 16 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.063 in standard form
Answer: 6.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 77
Answer: (x + 11)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.54cm -
4. Ratio Mixed ratio problems
Simplify: 20:12:20
Answer: 5:3:5 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 48, 40, 23, 33, what is the missing number?
Answer: 26