Keystones — Capstone
Five GCSE retrieval questions · 20 December 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 48°
Answer: 212.5cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 98, 95, 89, 69, 29, 58, 84
Answer: Mean = 70.4, Median = 84, Range = 69