Keystones — Lintel
Five GCSE retrieval questions · 12 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00085 in standard form
Answer: 8.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 21x + 108
Answer: (x + 12)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.26cm -
4. Ratio Mixed ratio problems
Express the second part of 5:11 as a fraction in simplest form
Answer: 11⁄16 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 34, 18, 22, 16, what is the missing number?
Answer: 50