Keystones — Capstone
Five GCSE retrieval questions · 13 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 199.24cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 14:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 82, 52, 39, 52, 36, 85, 71, 65. Give your answer to 2 decimal places
Answer: Mean = 61.78, Median = 65, Range = 49