Keystones — Capstone
Five GCSE retrieval questions · 19 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√45
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 2
Answer: 5(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 78°. Give your answer to 2 decimal places
Answer: 273.88cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 55, 33, 72, 48, 69, 35, 89, 96. Give your answer to 2 decimal places
Answer: Mean = 65.11, Median = 69, Range = 63