Keystones — Lintel
Five GCSE retrieval questions · 30 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
73000
Answer: 7.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 33°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
In ratio 1:4:4, what fraction is the second part?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 21, 48, 21, 30, 24, what is the missing number?
Answer: 90