Keystones — Capstone
Five GCSE retrieval questions · 20 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 6
Answer: 2(x + 6)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 26cm, angle = 77°. Give your answer to 2 decimal places
Answer: 152cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 76, 98, 75, 23, 96, 50. Give your answer to 2 decimal places
Answer: Mean = 67.86, Median = 75, Range = 75