Keystones — Capstone
Five GCSE retrieval questions · 20 July 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 63°
Answer: 245cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 47, 88, 29, 75, 100, 39, 47, 22
Answer: Mean = 51.3, Median = 47, Range = 85