Keystones — Capstone
Five GCSE retrieval questions · 25 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 5
Answer: 5(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 127.79cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 15, 57, 16, 84, 64, 60, 46, 99. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 57, Range = 84