Keystones — Capstone
Five GCSE retrieval questions · 10 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 68°. Give your answer to 2 decimal places
Answer: 157.62cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 77, 65, 17, 52, 77, 87, 36
Answer: Mean = 61.25, Median = 71, Range = 70