Keystones — Lintel
Five GCSE retrieval questions · 5 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
10000000
Answer: 1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 58°. Find opposite
Answer: 43.2cm -
4. Ratio Mixed ratio problems
In ratio 2:4:4, what fraction is the second part?
Answer: 4⁄10 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 43, 48, 33, 34, 29, what is the missing number?
Answer: 11