Keystones — Capstone
Five GCSE retrieval questions · 10 November 2024 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 71°
Answer: 236.4cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:4. Find a:b:c.
Answer: 6:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 89, 51, 91, 43, 68, 50
Answer: Mean = 67.1, Median = 68, Range = 48