Keystones — Cornerstone
Five GCSE retrieval questions · 21 September 2026 · mathsvault.uk/keystones
-
1. Number Rounding to significant figures
Round 1382 to 2 significant figures
Answer: 1400 -
2. Algebra Factorising into a single bracket
Factorise: 9x² + 9x
Answer: 9x(x + 1) -
3. Geometry Speed, distance and time
A car travels at 79km/h for 4 hours. How far does it travel?
Answer: 316km -
4. Ratio Percentage increase and decrease
Increase 109 by 20%
Answer: 130.8 -
5. Statistics Simple probability
A bag has 6 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2