Keystones — Capstone
Five GCSE retrieval questions · 10 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 9
Answer: 5(x + 4)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 50°. Give your answer to 2 decimal places
Answer: 153.21cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 94, 67, 20, 54, 92, 53, 98. Give your answer to 2 decimal places
Answer: Mean = 70.38, Median = 76, Range = 78