Keystones — Capstone
Five GCSE retrieval questions · 28 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 12
Answer: (x - 9⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 54°. Give your answer to 2 decimal places
Answer: 182.03cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 39, 44, 41, 53, 86, 21, 75. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 48.5, Range = 65