Keystones — Capstone
Five GCSE retrieval questions · 14 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 9x + 7
Answer: (x + 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 50°. Give your answer to 2 decimal places
Answer: 298.76cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 89, 12, 40, 48, 78, 51, 51
Answer: Mean = 51.25, Median = 49.5, Range = 77