Keystones — Lintel
Five GCSE retrieval questions · 26 January 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00058 in standard form
Answer: 5.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.62cm -
4. Ratio Mixed ratio problems
Express the first part of 10:9 as a fraction in simplest form
Answer: 10⁄19 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 19, 27, 38, 15, what is the missing number?
Answer: 41