Keystones — Capstone
Five GCSE retrieval questions · 5 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 5x - 6
Answer: (x + 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 58°. Give your answer to 2 decimal places
Answer: 132.3cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 28:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 53, 84, 34, 68, 14, 42, 37, 25. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 42, Range = 70