Keystones — Capstone
Five GCSE retrieval questions · 28 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 6
Answer: 4(x - 3)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 77°. Give your answer to 2 decimal places
Answer: 350.77cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 28:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 32, 23, 14, 59, 99, 100, 82, 11. Give your answer to 2 decimal places
Answer: Mean = 50.44, Median = 34, Range = 89