Keystones — Capstone
Five GCSE retrieval questions · 28 October 2018 · 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 74°
Answer: 182.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 50, 13, 74, 40, 96, 54, 14
Answer: Mean = 48.3, Median = 50, Range = 83