Keystones — Capstone
Five GCSE retrieval questions · 31 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 6
Answer: 2(x - 6)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 45°. Give your answer to 2 decimal places
Answer: 140.01cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 45, 11, 95, 57, 36, 81, 44, 99. Give your answer to 2 decimal places
Answer: Mean = 61.44, Median = 57, Range = 88