Keystones — Capstone
Five GCSE retrieval questions · 9 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 3x - 3
Answer: (x + 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 69°. Give your answer to 2 decimal places
Answer: 104.56cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 44, 74, 47, 11, 30, 62, 64, 43. Give your answer to 2 decimal places
Answer: Mean = 44.67, Median = 44, Range = 63