Keystones — Capstone
Five GCSE retrieval questions · 25 October 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√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 = 20cm, angle = 71°
Answer: 189.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 69, 13, 27, 11, 41, 27
Answer: Mean = 31.1, Median = 27, Range = 58