Keystones — Capstone
Five GCSE retrieval questions · 2 August 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 50°
Answer: 143.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 59, 89, 26, 55, 45, 55
Answer: Mean = 55.3, Median = 55, Range = 63