Keystones — Capstone
Five GCSE retrieval questions · 19 February 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 4.4x
Answer: (x + 2.2)² - 4.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 60°
Answer: 171.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 79, 91, 77, 67, 75, 87, 67
Answer: Mean = 77.5, Median = 77, Range = 24