Keystones — Lintel
Five GCSE retrieval questions · 16 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00048 in standard form
Answer: 4.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.42cm -
4. Ratio Mixed ratio problems
Express the second part of 3:15 as a fraction in simplest form
Answer: 5⁄6 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 49, 18, 45, 26, what is the missing number?
Answer: 22