Keystones — Capstone
Five GCSE retrieval questions · 20 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√32
Answer: 16√2 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 3
Answer: 2(x + 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 28cm, angle = 72°. Give your answer to 2 decimal places
Answer: 306.24cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:12:28 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 32, 35, 81, 71, 23, 61, 86, 58
Answer: Mean = 52, Median = 58, Range = 65