Keystones — Capstone
Five GCSE retrieval questions · 14 May 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 = 19cm, b = 20cm, angle = 53°
Answer: 151.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 2:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 23, 35, 86, 97, 45, 54
Answer: Mean = 57.1, Median = 54, Range = 74