Keystones — Capstone
Five GCSE retrieval questions · 3 April 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 68°
Answer: 144.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 17, 62, 96, 65, 78, 42, 93, 69
Answer: Mean = 60.7, Median = 65, Range = 79