Keystones — Capstone
Five GCSE retrieval questions · 10 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - x + 3
Answer: (x - 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 49°. Give your answer to 2 decimal places
Answer: 207.55cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 19, 67, 30, 11, 74, 17, 100, 58. Give your answer to 2 decimal places
Answer: Mean = 50.11, Median = 58, Range = 89