Keystones — Capstone
Five GCSE retrieval questions · 18 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 15
Answer: 2(x - 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 54°. Give your answer to 2 decimal places
Answer: 58.25cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 4:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 40, 96, 91, 91, 66, 96, 18, 94. Give your answer to 2 decimal places
Answer: Mean = 69.22, Median = 91, Range = 78