Keystones — Capstone
Five GCSE retrieval questions · 13 October 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 79°
Answer: 247.4cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 59, 88, 36, 78, 38, 94, 54, 12
Answer: Mean = 56.8, Median = 54, Range = 82