Keystones — Capstone
Five GCSE retrieval questions · 7 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 5x
Answer: (x - 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 47°. Give your answer to 2 decimal places
Answer: 184.3cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 26, 20, 35, 24, 72, 87, 53. Give your answer to 2 decimal places
Answer: Mean = 47.13, Median = 44, Range = 67