Keystones — Lintel
Five GCSE retrieval questions · 20 January 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00058
Answer: 5.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite
Answer: 15.3cm -
4. Ratio Mixed ratio problems
Divide 65 in the ratio 1:2:2
Answer: 13, 26 and 26 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 41, 47, 19, 41, what is the missing number?
Answer: -23