Keystones — Capstone
Five GCSE retrieval questions · 18 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 5x - 5
Answer: (x + 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 72°. Give your answer to 2 decimal places
Answer: 239.67cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 93, 56, 36, 57, 76, 26, 46
Answer: Mean = 56, Median = 56.5, Range = 67