Keystones — Capstone
Five GCSE retrieval questions · 7 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√275
Answer: 25√11 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 13
Answer: 5(x + 4)² - 93 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 69°. Give your answer to 2 decimal places
Answer: 291.28cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 21:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 58, 94, 92, 93, 95, 55. Give your answer to 2 decimal places
Answer: Mean = 81.14, Median = 92, Range = 40