Keystones — Cornerstone
Five GCSE retrieval questions · 26 November 2025 · mathsvault.uk/keystones
-
1. Number
What is the missing number: 98 + ? = 162
Answer: 64 -
2. Algebra
Collect like terms: 6x + 2y + 5x + 2y
Answer: 11x + 4y -
3. Geometry
Calculate the area of a circle with diameter 15cm
Answer: 176.71cm² -
4. Ratio
Simplify the ratio 12:28
Answer: 3:7 -
5. Statistics
A bag has 5 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 5⁄12