Keystones — Capstone
Five GCSE retrieval questions · 14 August 2021 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 42°
Answer: 131.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 41, 16, 11, 38, 79, 44, 66, 17
Answer: Mean = 40.2, Median = 41, Range = 68