Keystones — Capstone
Five GCSE retrieval questions · 30 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: x² - 3x
Answer: (x - 3⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 58°. Give your answer to 2 decimal places
Answer: 265.02cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 13, 43, 75, 48, 44, 73. Give your answer to 2 decimal places
Answer: Mean = 54.14, Median = 48, Range = 70