Keystones — Capstone
Five GCSE retrieval questions · 15 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 3
Answer: (x - 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 75°. Give your answer to 2 decimal places
Answer: 352.08cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:40:24 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 82, 100, 95, 53, 61, 26, 89. Give your answer to 2 decimal places
Answer: Mean = 67.63, Median = 71.5, Range = 74