Keystones — Cornerstone
Five GCSE retrieval questions · 10 March 2026 · mathsvault.uk/keystones
-
1. Number Rounding to significant figures
Round 522 to 1 significant figure
Answer: 500 -
2. Algebra Factorising into a single bracket
Factorise: 9x² + 4x
Answer: x(9x + 4) -
3. Geometry Speed, distance and time
A car travels at 35km/h for 5 hours. How far does it travel?
Answer: 175km -
4. Ratio Percentage increase and decrease
Decrease 224 by 20%
Answer: 179.2 -
5. Statistics Simple probability
A bag has 4 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 4⁄7