Keystones — Capstone
Five GCSE retrieval questions · 27 April 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 55°
Answer: 143.4cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 58, 76, 35, 84, 33, 22, 96, 12
Answer: Mean = 48.7, Median = 35, Range = 84