Keystones — Capstone
Five GCSE retrieval questions · 13 November 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
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 = 30cm, b = 16cm, angle = 50°
Answer: 183.9cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 22, 26, 63, 58, 80, 16, 94
Answer: Mean = 47.8, Median = 58, Range = 78