Keystones — Capstone
Five GCSE retrieval questions · 4 March 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 63°
Answer: 144.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 50, 51, 66, 62, 42, 28, 95
Answer: Mean = 55.3, Median = 51, Range = 67