Keystones — Capstone
Five GCSE retrieval questions · 24 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 12
Answer: 5(x + 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 47°. Give your answer to 2 decimal places
Answer: 184.3cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 32:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 59, 43, 81, 32, 12, 49, 75
Answer: Mean = 46.5, Median = 46, Range = 69