Keystones — Capstone
Five GCSE retrieval questions · 3 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 10
Answer: 4(x + 5)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 65°. Give your answer to 2 decimal places
Answer: 223.86cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 34, 40, 98, 74, 78, 15, 88. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 57, Range = 83