Keystones — Capstone
Five GCSE retrieval questions · 14 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 7
Answer: 5(x + 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 42°. Give your answer to 2 decimal places
Answer: 252.93cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 63:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 18, 26, 29, 35, 86, 16, 21. Give your answer to 2 decimal places
Answer: Mean = 35.88, Median = 27.5, Range = 70