Keystones — Capstone
Five GCSE retrieval questions · 16 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 14
Answer: 3(x - 2)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 25cm, angle = 78°. Give your answer to 2 decimal places
Answer: 317.9cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 18:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 41, 28, 39, 59, 73, 97. Give your answer to 2 decimal places
Answer: Mean = 52.14, Median = 41, Range = 69