Keystones — Capstone
Five GCSE retrieval questions · 28 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 5x - 4
Answer: (x + 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 57°. Give your answer to 2 decimal places
Answer: 117.41cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 18:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 80, 41, 42, 92, 68, 98, 11
Answer: Mean = 56.5, Median = 55, Range = 87