Keystones — Lintel
Five GCSE retrieval questions · 14 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0076
Answer: 7.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 50°. Find opposite
Answer: 32.2cm -
4. Ratio Mixed ratio problems
In ratio 2:2:1, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 46, 47, 45, 38, what is the missing number?
Answer: -11