Keystones — Lintel
Five GCSE retrieval questions · 12 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0022
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 30°. Find opposite
Answer: 8.7cm -
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 39. If 5 of them are 28, 47, 44, 43, 47, what is the missing number?
Answer: 25