Keystones — Lintel
Five GCSE retrieval questions · 17 July 2019 · mathsvault.uk/keystones
-
1. Number Converting to standard form
430000
Answer: 4.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 40°. Find opposite
Answer: 11.7cm -
4. Ratio Mixed ratio problems
In ratio 4:2:3, what fraction is the second part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 20, 49, 15, 38, 30, what is the missing number?
Answer: 28