Keystones — Capstone
Five GCSE retrieval questions · 16 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 6
Answer: 2(x - 6)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 156.22cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 36:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 19, 43, 63, 56, 50, 44. Give your answer to 2 decimal places
Answer: Mean = 46.86, Median = 50, Range = 44