Keystones — Capstone
Five GCSE retrieval questions · 25 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² + x - 5
Answer: (x + 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 110.31cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 35, 61, 81, 79, 25, 92
Answer: Mean = 67, Median = 79, Range = 71