Keystones — Capstone
Five GCSE retrieval questions · 27 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 9
Answer: 4(x + 3)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 57°. Give your answer to 2 decimal places
Answer: 188.7cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 56:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 54, 90, 83, 63, 22, 49, 31
Answer: Mean = 57, Median = 58.5, Range = 68