Keystones — Capstone
Five GCSE retrieval questions · 6 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 3
Answer: (x + 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 49°. Give your answer to 2 decimal places
Answer: 186.04cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 68, 89, 22, 45, 50, 83, 41, 79. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 50, Range = 67