Keystones — Capstone
Five GCSE retrieval questions · 12 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 3x - 1
Answer: (x + 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 13cm, angle = 72°. Give your answer to 2 decimal places
Answer: 185.46cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 51, 62, 24, 67, 14, 41, 28
Answer: Mean = 40.75, Median = 40, Range = 53