Keystones — Capstone
Five GCSE retrieval questions · 18 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√75
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² - 3x + 3
Answer: (x - 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 30cm, angle = 55°. Give your answer to 2 decimal places
Answer: 307.18cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 39, 93, 20, 88, 51, 15, 31
Answer: Mean = 52.75, Median = 45, Range = 78