Keystones — Capstone
Five GCSE retrieval questions · 20 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 10
Answer: 3(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 76°. Give your answer to 2 decimal places
Answer: 380.36cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:30:6 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 54, 97, 51, 74, 93, 77. Give your answer to 2 decimal places
Answer: Mean = 70.86, Median = 74, Range = 47