Keystones — Lintel
Five GCSE retrieval questions · 2 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000087 in standard form
Answer: 8.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.44cm -
4. Ratio Mixed ratio problems
Express the second part of 10:6 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 28, 26, 23, 40, 35, what is the missing number?
Answer: 16