Keystones — Capstone
Five GCSE retrieval questions · 19 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 11
Answer: 5(x + 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 183.85cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 11, 45, 74, 15, 86, 63, 92. Give your answer to 2 decimal places
Answer: Mean = 55.13, Median = 59, Range = 81