Keystones — Capstone
Five GCSE retrieval questions · 17 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√18
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 12
Answer: (x + 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 44°. Give your answer to 2 decimal places
Answer: 251.81cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:20:16 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 82, 61, 70, 48, 25, 33, 41, 25. Give your answer to 2 decimal places
Answer: Mean = 51.22, Median = 48, Range = 57