Keystones — Capstone
Five GCSE retrieval questions · 3 January 2012 · 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 + 7x + 5
Answer: (x + 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 79°. Give your answer to 2 decimal places
Answer: 204.18cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 71, 95, 61, 33, 38, 88. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 71, Range = 62