Keystones — Lintel
Five GCSE retrieval questions · 21 May 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.015
Answer: 1.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 30°. Find opposite
Answer: 12.7cm -
4. Ratio Mixed ratio problems
In ratio 1:2:4, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 38, 19, 31, what is the missing number?
Answer: 72