Keystones — Capstone
Five GCSE retrieval questions · 11 July 2011 · 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 - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 63°. Give your answer to 2 decimal places
Answer: 215.18cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 32, 76, 42, 89, 98, 24. Give your answer to 2 decimal places
Answer: Mean = 60.57, Median = 63, Range = 74