Keystones — Capstone
Five GCSE retrieval questions · 31 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 4
Answer: 4(x - 3)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 80°. Give your answer to 2 decimal places
Answer: 106.36cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 42:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 66, 32, 32, 85, 85, 55, 52
Answer: Mean = 57.75, Median = 55, Range = 53