Keystones — Capstone
Five GCSE retrieval questions · 9 November 2019 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 24cm, angle = 52°
Answer: 264.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 51, 98, 69, 95, 78, 47, 16, 61
Answer: Mean = 67.6, Median = 69, Range = 82