Keystones — Cornerstone
Five GCSE retrieval questions · 29 April 2026 · mathsvault.uk/keystones
-
1. Number Rounding to significant figures
Round 239 to 1 significant figure
Answer: 200 -
2. Algebra Factorising into a single bracket
Factorise: 12x + 30
Answer: 6(2x + 5) -
3. Geometry Speed, distance and time
A cyclist travels 257km in 7 hours. What is their average speed?
Answer: 36.714285714286km/h -
4. Ratio Percentage increase and decrease
Decrease 432 by 21%
Answer: 341.28 -
5. Statistics Simple probability
A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 2⁄5