Keystones — Capstone
Five GCSE retrieval questions · 12 December 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 80°
Answer: 135.9cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 9:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 83, 87, 42, 33, 61, 47, 100
Answer: Mean = 65.9, Median = 74, Range = 67