Keystones — Capstone
Five GCSE retrieval questions · 31 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 3x - 9
Answer: (x - 3⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 61°. Give your answer to 2 decimal places
Answer: 204.66cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 28:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 64, 65, 55, 81, 47, 85, 100, 26. Give your answer to 2 decimal places
Answer: Mean = 65.89, Median = 65, Range = 74