Keystones — Lintel
Five GCSE retrieval questions · 19 March 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
68000
Answer: 6.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 37°. Find adjacent side
Answer: 16.8cm -
4. Ratio Mixed ratio problems
In ratio 2:3:4, what fraction is the second part?
Answer: 3⁄9 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 38, 32, 21, what is the missing number?
Answer: -3