Keystones — Capstone
Five GCSE retrieval questions · 29 March 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 71°
Answer: 255.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 51, 50, 52, 76, 79, 13, 31
Answer: Mean = 54.3, Median = 52, Range = 69