Keystones — Capstone
Five GCSE retrieval questions · 18 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 10
Answer: 3(x + 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 63°. Give your answer to 2 decimal places
Answer: 106.92cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 93, 51, 22, 51, 25, 69
Answer: Mean = 53, Median = 51, Range = 71