Keystones — Capstone
Five GCSE retrieval questions · 23 August 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 64°
Answer: 218.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:5. Find a:b:c.
Answer: 2:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 33, 91, 91, 13, 87, 50, 86, 50
Answer: Mean = 61.7, Median = 54, Range = 78