Keystones — Capstone
Five GCSE retrieval questions · 1 July 2021 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 68°
Answer: 111.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 17, 70, 46, 31, 99, 94, 56
Answer: Mean = 63.3, Median = 70, Range = 82