Keystones — Capstone
Five GCSE retrieval questions · 11 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 78°. Give your answer to 2 decimal places
Answer: 123.25cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:14:10 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 35, 23, 89, 99, 13, 75, 11, 77. Give your answer to 2 decimal places
Answer: Mean = 56.78, Median = 75, Range = 88