Keystones — Capstone
Five GCSE retrieval questions · 16 January 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 65°
Answer: 82.5cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 41, 81, 22, 25, 12, 31, 62
Answer: Mean = 39.5, Median = 41, Range = 69