Keystones — Lintel
Five GCSE retrieval questions · 8 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.093
Answer: 9.3 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 39°. Find opposite
Answer: 17cm -
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 39. If 4 of them are 21, 37, 42, 41, what is the missing number?
Answer: 54