Keystones — Capstone
Five GCSE retrieval questions · 7 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² + 5x + 7
Answer: (x + 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 42°. Give your answer to 2 decimal places
Answer: 96.35cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 27:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 33, 41, 100, 74, 42, 85, 62, 20. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 42, Range = 80