Keystones — Capstone
Five GCSE retrieval questions · 25 December 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
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 = 14cm, b = 27cm, angle = 70°
Answer: 177.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:3. Find a:b:c.
Answer: 2:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 82, 96, 82, 36, 73, 40
Answer: Mean = 63.1, Median = 73, Range = 63