Keystones — Capstone
Five GCSE retrieval questions · 30 August 2014 · 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 + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 72°. Give your answer to 2 decimal places
Answer: 344.76cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 15, 71, 22, 12, 53, 10, 99, 100. Give your answer to 2 decimal places
Answer: Mean = 48.67, Median = 53, Range = 90