Keystones — Capstone
Five GCSE retrieval questions · 28 May 2019 · 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 + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 19cm, angle = 50°
Answer: 181.9cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 30, 52, 96, 49, 78, 12, 98, 93
Answer: Mean = 63.3, Median = 62, Range = 86