Keystones — Capstone
Five GCSE retrieval questions · 7 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 11
Answer: 2(x - 5)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 63°. Give your answer to 2 decimal places
Answer: 136.32cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 30:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 84, 57, 59, 96, 44, 85. Give your answer to 2 decimal places
Answer: Mean = 73.14, Median = 84, Range = 52