Keystones — Lintel
Five GCSE retrieval questions · 2 March 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
360000
Answer: 3.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 39°. Find adjacent side
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 39, 19, 33, what is the missing number?
Answer: 5