Keystones — Lintel
Five GCSE retrieval questions · 27 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0085 in standard form
Answer: 8.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.67cm -
4. Ratio Mixed ratio problems
Express the first part of 8:2 as a fraction in simplest form
Answer: 4⁄5 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 21, 17, 48, 25, 16, what is the missing number?
Answer: 17