Keystones — Capstone
Five GCSE retrieval questions · 24 November 2019 · 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 + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 54°
Answer: 94.7cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 57, 29, 27, 81, 26, 81, 80, 23
Answer: Mean = 55.4, Median = 57, Range = 72