Keystones — Capstone
Five GCSE retrieval questions · 26 October 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 50°
Answer: 185.4cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 91, 74, 63, 56, 35, 94, 56, 31
Answer: Mean = 56.8, Median = 56, Range = 83