Keystones — Lintel
Five GCSE retrieval questions · 10 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000092 in standard form
Answer: 9.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.07cm -
4. Ratio Mixed ratio problems
Express the second part of 10:2 as a fraction in simplest form
Answer: 1⁄6 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 25, 26, 35, what is the missing number?
Answer: 38