Keystones — Capstone
Five GCSE retrieval questions · 14 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 14
Answer: 2(x + 4)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 145.6cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 18, 50, 41, 81, 46, 89, 97
Answer: Mean = 63.5, Median = 65.5, Range = 79