Keystones — Capstone
Five GCSE retrieval questions · 6 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² - 5x + 10
Answer: (x - 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 73°. Give your answer to 2 decimal places
Answer: 178.83cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 90, 76, 21, 33, 39, 76, 74, 18
Answer: Mean = 52, Median = 41, Range = 72