Keystones — Capstone
Five GCSE retrieval questions · 22 February 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 76°
Answer: 291.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:3. Find a:b:c.
Answer: 16:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 82, 41, 62, 12, 92, 69
Answer: Mean = 60.9, Median = 68, Range = 80