Keystones — Capstone
Five GCSE retrieval questions · 26 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 4
Answer: 5(x - 5)² - 121 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 318.05cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 45:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 62, 57, 67, 51, 32, 75. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 57, Range = 58