Keystones — Capstone
Five GCSE retrieval questions · 21 September 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 22cm, angle = 80°
Answer: 260cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 52, 59, 33, 59, 67, 91
Answer: Mean = 63.3, Median = 59, Range = 58