Keystones — Capstone
Five GCSE retrieval questions · 13 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 15
Answer: 5(x - 3)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 162.78cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 12:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 89, 73, 96, 70, 92, 41, 97. Give your answer to 2 decimal places
Answer: Mean = 80.88, Median = 89, Range = 56