Keystones — Capstone
Five GCSE retrieval questions · 18 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 62°. Give your answer to 2 decimal places
Answer: 95.36cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 87, 59, 93, 36, 15, 26. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 59, Range = 78