Keystones — Capstone
Five GCSE retrieval questions · 5 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² - 5x + 3
Answer: (x - 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 28cm, angle = 63°. Give your answer to 2 decimal places
Answer: 174.64cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 38, 92, 39, 20, 60, 40. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 40, Range = 72