Keystones — Capstone
Five GCSE retrieval questions · 1 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 15
Answer: 2(x - 1)² + 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 59°. Give your answer to 2 decimal places
Answer: 192.86cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 47, 86, 40, 53, 82, 23, 93, 86. Give your answer to 2 decimal places
Answer: Mean = 65.56, Median = 80, Range = 70