Keystones — Capstone
Five GCSE retrieval questions · 7 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 237.55cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 35:28:24 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 100, 16, 100, 49, 42, 92, 70
Answer: Mean = 70, Median = 80.5, Range = 84