Keystones — Capstone
Five GCSE retrieval questions · 7 June 2018 · 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 70°
Answer: 253.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:5. Find a:b:c.
Answer: 2:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 38, 86, 18, 51, 82, 42
Answer: Mean = 56.3, Median = 51, Range = 68