Keystones — Capstone
Five GCSE retrieval questions · 18 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 3
Answer: 4(x - 5)² - 103 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 269.62cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 89, 97, 73, 48, 52, 50, 13. Give your answer to 2 decimal places
Answer: Mean = 58.38, Median = 51, Range = 84