Keystones — Capstone
Five GCSE retrieval questions · 24 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 11
Answer: 4(x + 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 186.77cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 16, 96, 71, 32, 30, 89, 32. Give your answer to 2 decimal places
Answer: Mean = 50.13, Median = 33.5, Range = 80