Keystones — Lintel
Five GCSE retrieval questions · 9 September 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0073
Answer: 7.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 32°. Find adjacent side
Answer: 17cm -
4. Ratio Mixed ratio problems
In ratio 4:3:4, what fraction is the second part?
Answer: 3⁄11 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 20, 46, 40, 16, 18, what is the missing number?
Answer: 70