Keystones — Capstone
Five GCSE retrieval questions · 27 August 2022 · 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 = 28cm, b = 27cm, angle = 56°
Answer: 313.4cm² -
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: 97, 45, 19, 15, 64, 77, 18
Answer: Mean = 47.9, Median = 45, Range = 82