Keystones — Capstone
Five GCSE retrieval questions · 29 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 15
Answer: 5(x - 2)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 67°. Give your answer to 2 decimal places
Answer: 322.18cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 93, 91, 46, 58, 66, 94, 88, 92. Give your answer to 2 decimal places
Answer: Mean = 80.11, Median = 91, Range = 48