Keystones — Capstone
Five GCSE retrieval questions · 1 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 5
Answer: (x - 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 64°. Give your answer to 2 decimal places
Answer: 177.96cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 80, 10, 34, 15, 17, 12, 94
Answer: Mean = 35.75, Median = 20.5, Range = 84