Keystones — Cornerstone
Five GCSE retrieval questions · 3 August 2025 · mathsvault.uk/keystones
-
1. Number
What is the missing number: 88 + ? = 150
Answer: 62 -
2. Algebra
Solve: x + 3 = 23
Answer: x = 20 -
3. Geometry
Opposite = 9cm, hypotenuse = 18cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify the ratio 18:6
Answer: 3:1 -
5. Statistics
Calculate the mean of: 28, 11, 5, 8, 21, 7, 26
Answer: 15.1