Keystones — Lintel
Five GCSE retrieval questions · 11 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 48°. Find opposite
Answer: 23.3cm -
4. Ratio Mixed ratio problems
In ratio 4:3:4, what fraction is the second part?
Answer: 3⁄11 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 19, 28, 46, what is the missing number?
Answer: 63