Keystones — Capstone
Five GCSE retrieval questions · 30 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 7
Answer: 5(x + 4)² - 87 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 20cm, angle = 48°. Give your answer to 2 decimal places
Answer: 185.79cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 12:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 62, 88, 22, 52, 78, 35. Give your answer to 2 decimal places
Answer: Mean = 59.14, Median = 62, Range = 66