Keystones — Capstone
Five GCSE retrieval questions · 18 March 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 79°
Answer: 159cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 89, 44, 12, 12, 15, 73, 15, 17
Answer: Mean = 37.1, Median = 17, Range = 77