Keystones — Capstone
Five GCSE retrieval questions · 16 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√96
Answer: 16√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 156.84cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 45:36:20 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 39, 15, 11, 97, 59, 28, 41, 15. Give your answer to 2 decimal places
Answer: Mean = 43.44, Median = 39, Range = 86