Keystones — Capstone
Five GCSE retrieval questions · 3 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 14
Answer: 2(x - 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 49°. Give your answer to 2 decimal places
Answer: 126.79cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 73, 38, 23, 95, 66, 16, 63
Answer: Mean = 48.5, Median = 50.5, Range = 81