Keystones — Capstone
Five GCSE retrieval questions · 2 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 4
Answer: 4(x + 5)² - 104 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 233.01cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 91, 67, 54, 45, 20, 42. Give your answer to 2 decimal places
Answer: Mean = 47.43, Median = 45, Range = 78