Keystones — Lintel
Five GCSE retrieval questions · 15 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
39000
Answer: 3.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 30°. Find opposite
Answer: 9.2cm -
4. Ratio Mixed ratio problems
In ratio 3:3:4, what fraction is the second part?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 29, 42, 16, 42, 24, what is the missing number?
Answer: 87