Keystones — Capstone
Five GCSE retrieval questions · 31 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 5
Answer: 2(x + 5)² - 55 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 75°. Give your answer to 2 decimal places
Answer: 175.8cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:42:18 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 93, 88, 43, 45, 42, 14, 98. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 44, Range = 86