Keystones — Capstone
Five GCSE retrieval questions · 6 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 1
Answer: 3(x + 2)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 60°. Give your answer to 2 decimal places
Answer: 96.99cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 71, 97, 23, 18, 28, 57, 19
Answer: Mean = 49.75, Median = 42.5, Range = 79