Keystones — Lintel
Five GCSE retrieval questions · 4 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
580000
Answer: 5.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 47°. Find opposite
Answer: 19.3cm -
4. Ratio Mixed ratio problems
In ratio 2:1:4, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 43, 35, 21, what is the missing number?
Answer: -3