Keystones — Lintel
Five GCSE retrieval questions · 19 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.057
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 55°. Find adjacent side
Answer: 13.8cm -
4. Ratio Mixed ratio problems
In ratio 1:2:2, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 49, 27, 49, 35, what is the missing number?
Answer: 0