Keystones — Capstone
Five GCSE retrieval questions · 12 April 2025 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 50°
Answer: 322.cm² -
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: 13, 92, 46, 31, 71, 98, 63, 51
Answer: Mean = 58.1, Median = 63, Range = 85