Keystones — Lintel
Five GCSE retrieval questions · 4 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
120000
Answer: 1.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 39°. Find adjacent side
Answer: 31.cm -
4. Ratio Mixed ratio problems
Express the first part of 2:6 as a fraction in simplest form
Answer: 1⁄4 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 46, 35, 31, 34, what is the missing number?
Answer: 29