Keystones — Capstone
Five GCSE retrieval questions · 22 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 8
Answer: 5(x + 2)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 78°. Give your answer to 2 decimal places
Answer: 109.55cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 76, 79, 27, 77, 65, 63. Give your answer to 2 decimal places
Answer: Mean = 69.14, Median = 76, Range = 70