Keystones — Capstone
Five GCSE retrieval questions · 2 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 15
Answer: 2(x - 1)² + 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 75°. Give your answer to 2 decimal places
Answer: 217.33cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 72, 58, 67, 23, 49, 87. Give your answer to 2 decimal places
Answer: Mean = 59.43, Median = 60, Range = 64