Keystones — Capstone
Five GCSE retrieval questions · 14 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 75°. Give your answer to 2 decimal places
Answer: 172.42cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:6:16 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 80, 99, 39, 44, 24, 67. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 47, Range = 75