Keystones — Capstone
Five GCSE retrieval questions · 29 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 14
Answer: 5(x - 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 43°. Give your answer to 2 decimal places
Answer: 136.4cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 49, 29, 34, 49, 97, 13, 71
Answer: Mean = 52.25, Median = 49, Range = 84