Keystones — Capstone
Five GCSE retrieval questions · 20 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√54
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² - x - 4
Answer: (x - 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 20cm, angle = 41°. Give your answer to 2 decimal places
Answer: 164.01cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 14:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 39, 77, 72, 100, 10, 54, 25
Answer: Mean = 49.5, Median = 46.5, Range = 90