Keystones — Lintel
Five GCSE retrieval questions · 30 November 2022 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00031
Answer: 3.1 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 52°. Find adjacent side
Answer: 20.3cm -
4. Ratio Mixed ratio problems
In ratio 1:2:4, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 23, 27, 28, 37, what is the missing number?
Answer: 25