Keystones — Capstone
Five GCSE retrieval questions · 8 November 2019 · 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 27cm, angle = 44°
Answer: 159.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 100, 77, 20, 48, 19, 45
Answer: Mean = 48, Median = 45, Range = 81