Keystones — Lintel
Five GCSE retrieval questions · 4 March 2025 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.0034
Answer: 3.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 32°. Find opposite
Answer: 18.7cm -
4. Ratio Mixed ratio problems
£190.00 is shared between A and B in the ratio 3:2. How much does A receive?
Answer: £114.00 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 15, 28, 20, 47, what is the missing number?
Answer: -10