Keystones — Capstone
Five GCSE retrieval questions · 16 February 2021 · 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 68°
Answer: 298.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 69, 11, 23, 13, 63, 11, 35
Answer: Mean = 38.9, Median = 35, Range = 75