Keystones — Lintel
Five GCSE retrieval questions · 16 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.072
Answer: 7.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 53°. Find adjacent side
Answer: 13.8cm -
4. Ratio Mixed ratio problems
In ratio 4:3:1, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 39, 18, 40, 28, what is the missing number?
Answer: 30