Keystones — Capstone
Five GCSE retrieval questions · 10 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 4
Answer: 4(x + 3)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 74°. Give your answer to 2 decimal places
Answer: 198.98cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 27, 22, 76, 74, 30, 68, 50
Answer: Mean = 52.25, Median = 59, Range = 54