Keystones — Lintel
Five GCSE retrieval questions · 4 August 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.051
Answer: 5.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 35°. Find adjacent side
Answer: 31.cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 31, 28, 31, 22, what is the missing number?
Answer: 88