Keystones — Capstone
Five GCSE retrieval questions · 14 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - x - 8
Answer: (x - 1⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 120.71cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 14, 62, 78, 18, 75, 74, 91, 24. Give your answer to 2 decimal places
Answer: Mean = 56.89, Median = 74, Range = 77