Keystones — Capstone
Five GCSE retrieval questions · 4 December 2010 · 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: 3x² + 12x - 12
Answer: 3(x + 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 118.79cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 40:15:27 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 12, 28, 90, 90, 52, 79. Give your answer to 2 decimal places
Answer: Mean = 54.29, Median = 52, Range = 78