Keystones — Capstone
Five GCSE retrieval questions · 28 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 4
Answer: 5(x + 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 76°. Give your answer to 2 decimal places
Answer: 221.23cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:30:18 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 89, 23, 64, 13, 21, 23, 97
Answer: Mean = 45.25, Median = 27.5, Range = 84