Keystones — Capstone
Five GCSE retrieval questions · 24 April 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
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 = 16cm, b = 30cm, angle = 41°
Answer: 157.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 8:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 40, 73, 80, 24, 21, 60
Answer: Mean = 47.7, Median = 40, Range = 59