Keystones — Lintel
Five GCSE retrieval questions · 7 May 2021 · mathsvault.uk/keystones
-
1. Number Converting to standard form
42000000
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 44°. Find opposite
Answer: 13.5cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 46, 21, 48, 43, 25, what is the missing number?
Answer: -27