Keystones — Capstone
Five GCSE retrieval questions · 8 September 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 42°
Answer: 72.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 36, 50, 77, 50, 18, 65, 20
Answer: Mean = 51.5, Median = 50, Range = 78