Keystones — Capstone
Five GCSE retrieval questions · 26 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 6
Answer: (x - 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 20cm, angle = 44°. Give your answer to 2 decimal places
Answer: 125.04cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 31, 38, 40, 93, 87, 30, 64. Give your answer to 2 decimal places
Answer: Mean = 57.88, Median = 52, Range = 63