Keystones — Capstone
Five GCSE retrieval questions · 7 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² - 9x - 12
Answer: (x - 9⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 64°. Give your answer to 2 decimal places
Answer: 296.6cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 28:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 78, 25, 33, 39, 58, 80. Give your answer to 2 decimal places
Answer: Mean = 58.86, Median = 58, Range = 74