Keystones — Cornerstone
Five GCSE retrieval questions · 22 January 2026 · mathsvault.uk/keystones
-
1. Number Rounding to significant figures
Round 689 to 1 significant figure
Answer: 600 -
2. Algebra Factorising into a single bracket
Factorise: 15x + 35
Answer: 5(3x + 7) -
3. Geometry Speed, distance and time
A cyclist travels 316km in 7 hours. What is their average speed?
Answer: 45.142857142857km/h -
4. Ratio Percentage increase and decrease
Increase 61 by 20%
Answer: 73.2 -
5. Statistics Simple probability
A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 7⁄13