Keystones — Capstone
Five GCSE retrieval questions · 13 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 54°. Give your answer to 2 decimal places
Answer: 229.36cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 36:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 62, 33, 47, 22, 34, 85, 77, 100. Give your answer to 2 decimal places
Answer: Mean = 58.78, Median = 62, Range = 78