Keystones — Capstone
Five GCSE retrieval questions · 20 August 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 52°
Answer: 93.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:5. Find a:b:c.
Answer: 2:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 36, 92, 67, 24, 17, 70, 94
Answer: Mean = 52.1, Median = 67, Range = 77