Keystones — Capstone
Five GCSE retrieval questions · 8 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 3
Answer: 3(x - 6)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 72°. Give your answer to 2 decimal places
Answer: 178.32cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 41, 84, 86, 41, 91, 46, 47
Answer: Mean = 60.75, Median = 48.5, Range = 50