Keystones — Capstone
Five GCSE retrieval questions · 13 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√32
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: x² - 11x + 11
Answer: (x - 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 185.62cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 56, 25, 80, 27, 89, 93, 63. Give your answer to 2 decimal places
Answer: Mean = 63.38, Median = 68.5, Range = 68