Keystones — Capstone
Five GCSE retrieval questions · 8 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 10
Answer: 3(x + 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 63.89cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 2:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 29, 42, 32, 27, 71, 89, 26, 24. Give your answer to 2 decimal places
Answer: Mean = 40.33, Median = 29, Range = 66