Keystones — Capstone
Five GCSE retrieval questions · 20 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 10
Answer: 3(x + 2)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 41°. Give your answer to 2 decimal places
Answer: 212.56cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 49, 96, 51, 95, 43, 100. Give your answer to 2 decimal places
Answer: Mean = 76.29, Median = 95, Range = 57