Keystones — Capstone
Five GCSE retrieval questions · 3 June 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√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 = 17cm, b = 27cm, angle = 63°
Answer: 204.5cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 54, 44, 53, 49, 62, 15, 59
Answer: Mean = 44.6, Median = 53, Range = 47