Keystones — Lintel
Five GCSE retrieval questions · 4 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
22000000
Answer: 2.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 49°. Find adjacent side
Answer: 23cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:12
Answer: 1:1:2 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 45, 21, 40, 34, what is the missing number?
Answer: 35