Keystones — Capstone
Five GCSE retrieval questions · 11 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 9x - 11
Answer: (x + 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 15cm, angle = 52°. Give your answer to 2 decimal places
Answer: 165.48cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 19, 93, 94, 70, 26, 85, 99. Give your answer to 2 decimal places
Answer: Mean = 65.88, Median = 77.5, Range = 80