Keystones — Lintel
Five GCSE retrieval questions · 30 May 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.052
Answer: 5.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 28°. Find adjacent side
Answer: 35.3cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 34, 27, 24, 47, what is the missing number?
Answer: -22