Keystones — Capstone
Five GCSE retrieval questions · 29 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 3
Answer: 5(x + 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 54°. Give your answer to 2 decimal places
Answer: 262.12cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 12:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 65, 63, 33, 36, 46, 90, 75
Answer: Mean = 59, Median = 63.5, Range = 57