Keystones — Capstone
Five GCSE retrieval questions · 22 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 7
Answer: 5(x + 6)² - 173 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 72°. Give your answer to 2 decimal places
Answer: 266.3cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 30:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 95, 45, 75, 85, 87, 65, 68
Answer: Mean = 73.75, Median = 72.5, Range = 50