Keystones — Capstone
Five GCSE retrieval questions · 10 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 4
Answer: (x + 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 13cm, angle = 63°. Give your answer to 2 decimal places
Answer: 127.41cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 37, 19, 71, 14, 82, 81, 52
Answer: Mean = 55.75, Median = 61.5, Range = 76