Keystones — Capstone
Five GCSE retrieval questions · 11 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 8
Answer: 4(x + 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 66°. Give your answer to 2 decimal places
Answer: 285.48cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 32, 44, 74, 45, 34, 48, 26. Give your answer to 2 decimal places
Answer: Mean = 47.38, Median = 44.5, Range = 50