Keystones — Capstone
Five GCSE retrieval questions · 7 August 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 72°
Answer: 177.8cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:4. Find a:b:c.
Answer: 12:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 69, 100, 73, 100, 82, 93, 42, 90
Answer: Mean = 77.7, Median = 82, Range = 58