Keystones — Capstone
Five GCSE retrieval questions · 5 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√275
Answer: 25√11 -
2. Algebra Completing the square
Complete the square: x² - x - 2
Answer: (x - 1⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 47°. Give your answer to 2 decimal places
Answer: 276.45cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 98, 43, 51, 24, 32, 78, 42, 32. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 43, Range = 74