Keystones — Capstone
Five GCSE retrieval questions · 4 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 5
Answer: 3(x + 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 167.21cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 40, 80, 80, 61, 19, 16, 69, 29. Give your answer to 2 decimal places
Answer: Mean = 47.67, Median = 40, Range = 64