Keystones — Capstone
Five GCSE retrieval questions · 16 August 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 40°
Answer: 98.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 27, 52, 39, 43, 97, 54, 93
Answer: Mean = 52.1, Median = 52, Range = 85