Keystones — Capstone
Five GCSE retrieval questions · 12 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 47°. Give your answer to 2 decimal places
Answer: 118.84cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 28:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 89, 72, 81, 89, 16, 16. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 81, Range = 81